Sub-account and MTX/Stash tabs

Ok, so I want to cross-progress in PoE2 between PC and PS5. I merged my PS5 account into my PC account. I understand when PoE2 is out I can play under my PC account on both platforms and progress my character. I also understand MTX and Stash tabs are only available if you have purchased it on the platform.

My main question is with transferring purchases. If I move all my MTX/Stash tabs from the PS5 sub-account to PC so I can properly play, when the next PoE league launches do I now lose everything on PS5 since it is now under my "PC" sub-account and you cannot use that to play PoE 1? So if I want to use a bunch of tabs, do I need to own them on PC, PC account on PS5, AND PS5 sub-account? So to play both games I need 3 copies of things instead of just 2? Or am I misunderstanding?

For what i understand,

mTx and stash will Be Always active on ps4/5 poe1 and 2
When u Play poe2 on PC U can choose ur Playstation char and Play on. MTx will BE dissabled , also stash. So U can Just Level ur stashs will BE greyed Out. Only the normal stashes will BE usable .

U cant merge or Transfer mTx or stashes to PC .
Because of Sony its console specific and cant BE used Cross Platform. I think GGG must pay a Lot of Money, that IT would Work and will not so so