You’re the one that seems to misunderstand. If you have to spend 5 minutes switching back and forth between setups, you will only do it if you save a significant amount of time. So if a boss requires 10 minutes to kill and you spend 5 minutes switching, you won’t switch if it still takes 5 minutes. Almost no one will switch if it will take 4 minutes, because the hassle of doing that all the time just to save 1 minute is not worth it.
However, if it were instant everyone would do it even if it just saved 30 seconds.
Just look at PoE. You can instantly switch skills at any time and as a result everyone has an alternate set of gems to switch before a boss.
This is what the devs don’t want and what the current system prevents.
If you truly want to switch your build or adjust something, 5 minutes isn’t a big deal. But if you want to do it to cheese content, then it becomes too annoying and you need to have a really big gain to justify it.
YEs, except it isn’t the only way. You can still beat the content, it’s just not as fast. But if you could switch instantly, people would. Because given the choice “Would you rather spend 10 minutes beating this fight, or have the exact same effort and spend 5 minutes instead?” everyone clearly chooses the 2nd one.
While it’s true (and everyone agrees) that the system should be tuned so that it affects early game less, skill respec is not an issue for campaign. I’ve respecced multiple times at level 4, 10 or 20 and it didn’t top my progression at all.
It’s just when you’re new that you’re surprised by it.
As for experimenters, if you just want to try out a few variations at endgame, it’s not a big deal either.
If you simply want to theorycraft and constantly adjust stuff, then my idea above (you can search for it) of turning the arena dummies area into a free respec area (including mastery and class) would be a good solution. You tried things out, when you left you were back in your spec, but you already knew what you wanted to do.
The solution is not to scape the current method which is fulfilling its purpose, is to come up with another alternative for the non-cheesing cases…