(This is about the hazard portion of the post, not the pivot portion)Honestly, I think there are 2 general problems with Pokemon currently that can be fixed by Smogon.
First, is how mindless the Hazards Sub-Meta is currently.
This issue has existed since Gen 5 when Ferrothorn just became the dominate Hazard Setter, driving away so much competition that existed in Gen 4, and when Team Preview was introduced.
Although Ferrothorn is the least of the problems for the Hazard Metagame, as removing Hazards has become more braindead each Generation. Gen 6 buffed Defog and made Clefable a prominent figure, so that spin blockers became just an extra for some Pokemon. Gen 7 introduced an absurd amount of Defoggers into the meta. And now Gen 8 introduced Heavy-Duty Boots, Buffed Defog again, and buffed Rapid Spin. Gen 8 also removed pursuit to “compensate”, but now spin blocking is also just brain dead without pursuit, and the underlying problem is how freely opponents are able to switch.
This is especially bad when some Pokemon had Stealth Rock and other hazards in mind when balance was considered, such as Volcarona.
I will say that I don’t know how to approach these issues, but I can still recognize these things being issues. There are numerous ways to fix these issues as there are numerous options that provide these cancers.
Outright bans for certain moves? Ban on Heavy-Duty Boots? A new clause? Something else entirely?
But I think a lot of issues would be solved in this meta (and most metagames too) if Hazard Removal and Pivoting Moves became reasonable.
Why are you complaining about hazards?
At first I thought that you were calling them "braindead" because of their ease of use and massive effectiveness, but instead you complain they have got too easy to remove. You complain about the lack of diversity, and how ferrothorn has narrowed the hazard metagame to just a few key pokes, but then you bring up the fact that defog and rapid spin have been buffed and more widespread. Is this not counteractive? Is having more options healthy for variety? Maybe you were talking about how hazards setters are a dying breed, but this is also untrue. From what I can count, there are at least 14 viable users of stealth rocks, which excludes anything in BL or lower tiers. And OU even looks to have ~5 users of regular spikes, and for reference, gen 7 ou had 3 spikers, and gen 6 had 2. To be clear; variety had not gone "down," the amount of viable options span further than ever before, despite the dex cut.
Second, you seem to preface your whole argument around the fact that hazards are too easy to remove. This fundamentally makes no sense.
If a mechanic/move/type is underpowed, it isn't used, and the fact stealh rocks and defog find their way onto almost every team is a testament to their continued power.
But there is another reason this argument makes no sense.
When a mechanic is banned (such as dynamax, swift swim + drizzle in gen 5, etc.) it is not done for the sake of the mechanic. It is done so other pokemon can have more viability. For example, while dynamax was still allowed, pokemon that could easily abuse it were near impossible to stop, meaning the metagame revolved around those pokemon and their counters. Same with pre complex-ban rain in gen 5.
So why is this relevant?
Well, if hazards or hazard negation were to be banned, it would not be on the principle that hazards themselves are too powerful. It would be done because one strategy, with the power of hazards, is so centralizing that is makes the pool of viable pokemon incredibly small. This is not the case in gen 8 ou. Not a single strategy is overpowered because of hazards/defog, and not a single pokemon is OU because of hazards or defog. All pokemon that learn defog, rapid spin, stealth rocks, and spikes would persist to have viable niches (besides perhaps skarmory due to it then being outclassed by corviknight) without these moves.
So overall, I don't understand you hazard rant. Sure, you might prefer a different generations hazard system to the one we have currently, but with no reason to change anything I recommend staying as true to the original game as possible.