I think that it wouldent hurt to get everyone on the same page.
Here is an ccp presentation about legacy code
Most of its problems revolve arround posses.https://m.youtube.com/watch?v=JCR9q1MMO2E(its from 2015 but is still as valid as it has been since 2005)
The current sov system (aegis sov also known as fozziesov) has only minor fuel consumption gameplay element for TCUs. The in-game “owner” of sov is the TCU holder, while the IHUB owner is the one who gets all the sov benefits. The real “owner” has long been considered to be the IHUB owner, even if TCU is owned by a hostile entity, hence none of the null blocks care jack ■■■■ about the in-game description on who owns the sov via TCU. https://wiki.eveuniversity.org/Sovereignty
Taking this into account, I would imagine that OPs proposal regarding POSses would be quite complex to even make sense of and even harder to implement. I’m not saying that its nececery a bad idea (if you ignore that POSes will be deleted from game), we just have too litle details.
But I would imagine it could be implemented to smaller upwell structures; athanor, raitaru and astrahus. If those 3 structures could be captured with TCU gameplay, I would imagine it could actualy motivate players to create content. It could be awesome, atleast for a while, before things settle down again.