Disclaimer: I'm not an English speaker so I apologize in advance for any grammatical errors. This might end up being a long post so I'll put a tl;dr at the end of the post.
After having played about 75 games on the UU ladder with Crawdaunt allowed and having managed to acquire reqs, I can say pretty surely that I will be voting that Crawdaunt should be allowed to stay in the UU metagame and I'll explain you why. Even though Crawdaunt has a very high damage output and is a major threat to all kinds of teams, Crawdaunt has many flaws which I think balances it's positive points out. I will try to list some arguments from the do-not unban side, and say why I think the listed attributes to Crawdaunt aren't making it a banworthy Pokémon.
1. It is a major threat to slower paced bulkier teams, whilst still being a big threat to offensive teams.
While I do admit that this statement is true, this isn't a unique quality in wallbreakers, because their main effectiveness derives from being so threatening towards slower teams. From having played on the ladder using and facing Crawdaunts, i do have to concede the fact Crawdaunt pressures several teams due to it's strong attacks, defensive and offensive teams alike, this being due to it's strong attacks and it's access to a really strong Aqua Jet, which can do heavy damage to the offensive tier at +2. But this isn't something that only Crawdaunt can do, since Pokémon like Gatr and Sharpedo are both top tier Pokémon which have similar capabilites. There are still many viable Pokémon who can be used to beat Crawdaunt, while still having usability outside this, and if you deem Crawdaunt a huge threat to your team, there still is the capability of running a mon to serve as a revenge killer, which most teams can afford to do. Pokémon such as Chesnaught, Tangrowth, bulky waters on defensive teams, and Pokémon like Hydreigon, Salamence, Toxicroak, Shaymin on more offensively paced teams all can come in on Crawdaunt, and even though all these Crawdaunt checks range in how well they check it, they are available for all playstyles. There are also many Pokémon in UU, like Entei and Lucario, which are strong threats to slower teams while still being threatening vs offensive teams, which shows you that Crawdaunt is quite comparable to other mons which are currently residing in the UU metagame.
2. Crawdaunt has no counters depending on it's set.
You could hypothetically say that Crawdaunt has no counters, because it can run a SD set, a CB set, a LO set with Sludge Wave/Ice Beam/Aerial Ace as the fourth move and many more sets. This is the main thing which makes Crawdaunt such a threat, since the sets beats different things, and not all teams can prepare for all the Crawdaunt sets. The thing with this argument is that this statement holds true for many other Pokémon in the UU metagame, such as Hydreigon and Salamence, because what this statement allows you to do is say things like, 'you could run physically based Iron Tail + Superpower LO Hydreigon to beat Pokémon like Blissey/Porygon2/Umbreon/Florges' and 'you can run Choice Band Salamence with Outrage/Earthquake/Fire Fang/Iron Tail' to beat it's usual switchins. The thing with saying this is that these sets have other flaws over more standard sets, which is why the 'standard sets' are so good, and thus used more over these types of sets. What i'm trying to say is that while Crawdaunt is a big threat, other Pokémon in the metagame can do similar things depending on the set, thus this quality of being 'uncounterable' in theory isn't unique to only Crawdaunt, which makes me believe that this argument by the pro-ban side is lackluster.
3. Crawdaunt polarizes the tier around it.
This is another pro-ban argument presented, and in my opinion, this is a flawed statement, because this is how it goes whenever a new Pokémon is introduced into a tier. Like when Mamoswine dropped to UU, it made bulky waters more common in the tier, and this is how it goes for nearly all of the threats in not only the UU meta, but in every metagame, the fact that you have to adapt you team, offensive or defensive to the common trends in the metagame. Crawdaunt itself has issues getting on the field, and most of the pro-ban posts i've seen are assuming that Crawdaunt already has an advantageous matchup vs what it's facing. A well played Crawdaunt is a huge threat, but this could be said about every usable Pokémon in UU. I believe Crawdaunt to be a trend in the metagame, and even though in the beginning it might seem too overpowering for certain teams/playstyles, over time the metagame will adapt to it, like the metagame always does to new Pokémon. And that's why I believe that Crawdaunt will soon be another threat to prepare for, and because of this I will be voting to unban Crawdaunt.
Tl;dr:
While Crawdaunt might be a big threat to all kinds of team archetypes, many of the listed qualities of it aren't unique to it, and Craw itself has flaws as well, and it's different sets all have different limitations, and I believe that it will soon just be another Pokémon to prepare for in the UU metagame. And that's why I will be voting to allow Crawdaunt back in to UU.
I also want to thank
King UU for giving me advice about my post.