I agree with a lot of the points made here, but not at all with the conclusion. "Fun" as a concept is highly subjective, and while I hear what you're saying about the majority disliking Regenerator, there's no guarantee that will continue to be the case in the future (and is there even evidence for it now? From what I'm hearing, it sounds like recent surveys don't really corroborate that point). Plus, why would limiting an already limited playstyle be considered healthy for the tier? It's my opinion that, were there no Regenerator at all, it would be simply impossible to build a proper Stall team in an OU context, and even a Regen Clause would cripple them most likely to the point of no return. You said yourself Regen has counterplay, so then why are we even having this discussion? BellySpeed Linoone may be unfun to play against, but it's not unfair, so it's not banned. Double recovery move Chansey is also not very fun to play against in my opinion. It's still legal. At the end of the day, such subjective reasons for a ban or restriction seem very outside the norm and against the competitive nature of Smogon, so I hope that if any action takes place on Regen or HDB, it will be based on more directly competitive reasons.
- I have heard discussions of individual bans for Torn-T, HDB, or Pex, and a Regen Clause would likely satisfy all of those groups.
- Regen cores are somewhat restrictive when teambuilding, and limiting them would potentially free up other playstyles. As we have seen with Melmetal, though, "somewhat restrictive" isn't enough for most people on its own.
- Regen cores are pretty much mandatory to stall teams, and limiting them might make it impossible to build a truly viable stall team.