Originally Posted by Fat Jibaku
This is debatable as setting up allows Exca to simultaneously scare away Forry and the spinblocker. If calculated right it can pay off for the Rapid Spin Forretress got - if exca's team hasnt placed too many hazards down yet.
Maybe I just define stall differently. I define stall rather loosely: the main purpose would be to stall out the enemy, but as long as the purpose is kept, any aggressive additions won't change the fact that it's still stall. It's perfectly viable to run say, Fire Blast Blissey to minimize this kind of threat. I don't believe one bit that a stall team must play passively (in fact, this is how stall teams lose, because putting yourself in a position to only constantly respond to your opponent opens up exploits). The introduction of Scarf Palkia to DPP Uber stall to combat Darkrai, Rayquaza, and Specsogre did not compromise the stall playstyle at all, for instance. Since stall is defensive by nature, it places a lot of emphasis on covering threats. But there are many threats around, so stall itself must adapt to take care of the most important threats first, and as stated before, putting a more aggressive approach while maintaining the primary goal of the team is fine.
And this is a good point, and is something that the suspect test can help us answer :)
By having to run blissey over chansey you are already conceding that stall will have to become less viable, or run sub par pokemon, as blissey is clearly inferior in ubers, to maintain some level of competitiveness, not to mention you barely scratch excadrill in the rain. Another example of this is the support arceus forms, or lugia, who will have to run ridiculous movesets that compromise their effectivness against major threats and make them less able to check them, which is surely one of the main reasons any player uses stall.
Regardless of your pressure excadrill will reduce your hazard game to a dice roll, and it seems near impossible that stall can adapt to excadrill without taking a hit to its actual ability to stall, and similar things can be said of Kyogre in particular, who I would argue is more threatening individually to stall.
And to address the first part of your response, if the stall team in question actually needs the hazards that are up, such as in the middle stages of the game, the only time you can viably eq excadrill is on the switch, even if you assume it will attack. You are once again risking a 30% chance of something being kod, either your utility hazard layer and SPINNER, spinblocker, or losing your hazards, all critical things for any stall team to have a plan to protect in nearly any circumstance, if it plans to win consistently.