I guess if you don't want to use the feature you can continue using it as is.. there's no negative effect to this though.. so yes ofc (I don't mobile but if it were more user friendly I may attempt)
Sure, there are no downsides to this, I agree.
But by now we all know there are about 50 suggestions for ls that would be even better to be implemented but wont be.
If there ever has to be like a top 5 of things to implement that had been suggested this one would not make the list.
Not by a long shot.
And I play mobile only.
If you could make this a templete for all tiers and they would get taken directly from the vault when you reach the appropriate level and placed in the vault after switching, that would make group play viable on mobile.
Unrealistic, but vaulting is such a pain on mobile and this is the only way I can imagine it work for mobile group play.