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IV.) Unhealthy - elements that are neither uncompetitive nor broken, yet are deemed undesirable for the metagame, such that they inhibit "skillful play" to a large extent.
One of the arguments that Piloswine is unhealthy is that Piloswine enforces teambuilding linearity by forcing teams to have usually 2 checks to it, due to how capable Piloswine is at overwhelming just one. I'd like to push back at this however, by mentioning that Piloswine is not the first pokemon to do this however. Generally pokemon such as Monferno and far more so Pignite have long since popularized KoffQuax as a core, due to Knock + STAB CC often being able to easily overwhelm solo Quax as a physical check. It can be said that Monferno and Pignite are easier to check due to their needing to get the knock before immediately overwhelming the opponent, which I'd also like to push back against, because of how easy it is to loop pressure in SV due to the over-reliance on Tink as a special wall. There's not a terribly large connection between Monferno and Pignite needing to use Knock first, and not needing to run dual checks. Furthermore, CB Pignite in particular is a niche but existent option anyways, which forgoes the need to use Knock and can begin to kill everything immediately in a similar vein to CB Pilo.
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The other and more substantial argument is that Piloswine has pushed the metagame into a state where getting small amounts of chip on bulky waters often via tspikes or rocks + spinblocker (usually dusclops). However, I disagree that Piloswine is the primary driver of this situation. Even without Piloswine, there are still many viable pokemon (aformentioned fire/fightings, Raboot, and Krok
who gets better in the absence of Pilo) who make a living off of 2hkoing waters with hazards chip. In fact here's all the replays where Dusclops is used in UMPL (may have missed one or two, but generally I think I did fine).
https://replay.pokemonshowdown.com/smogtours-gen9nfe-884886 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-884424 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-884782
https://replay.pokemonshowdown.com/smogtours-gen9nfe-886687
https://replay.pokemonshowdown.com/smogtours-gen9nfe-887404 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-888347
https://replay.pokemonshowdown.com/smogtours-gen9nfe-888059
https://replay.pokemonshowdown.com/smogtours-gen9nfe-882825 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-883547
https://replay.pokemonshowdown.com/smogtours-gen9nfe-881127 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-880730?p2
https://replay.pokemonshowdown.com/smogtours-gen9nfe-880197
https://replay.pokemonshowdown.com/smogtours-gen9nfe-879060
https://replay.pokemonshowdown.com/smogtours-gen9nfe-876758 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-877242
https://replay.pokemonshowdown.com/smogtours-gen9nfe-876203
https://replay.pokemonshowdown.com/gen9nfe-2455215627-2y51m1n7nonyywwak6fl0xeg00xuvxbpw
https://replay.pokemonshowdown.com/smogtours-gen9nfe-875859
https://replay.pokemonshowdown.com/smogtours-gen9nfe-875574 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-874319 <- piloclops
https://replay.pokemonshowdown.com/smogtours-gen9nfe-875325
In only 8 out of 21 replays was Piloswine used alongside Dusclops. Far more often you see Piloswine used alongside Drakloak, due to Drakloak's incredible flexibility and speed tier. Furthermore, Drakloak is less of a problematic spinblocker due to its tendency to its lack of longevity and higher tendency to get forced out by breakers
including Piloswine. Some other statistics that may be tangentially relevant is that only 4/8 piloclops users won, and overall only 47.83% of Dusclops users won their games, although that latter statistic is slightly deflated due to a certain number of dusclops on dusclops violence. But I digress. Overall, this indicates to me not a problem specifically with Piloswine as the main perpetrator of the hazard stacking metagame, but rather with Dusclops for making sure that those hazards are almost never removed.