It might be best for them to not make any promises in term of what will be a definitive rule.
Indeed, since they need to adapt some of the rules (PnP to video game would require that), they probably still need time to find the proper balance.
Yes, still, even after all this time of EA.
Precisely. If Larian was 100% on final ruleset, then there would be no point of early access.
I think we’re close enough to final release to be reasonably assured we won’t see significant rule changes from EA.
I think that is a safe assumption to make, HOWEVER, it's been reported before with games playing with some major changes right before game's release (XCOM1 comes to mind, where devs where switching back and forth on a key feature right until shipping).
While I understand OPs dilemma, I don't think it is reasonable for Larian to commit to anything until they are ready (and even after release, I tend to appreciate rebalancing and updates, even if it messes up a bit with my ongoing playthrough). As 1.0 will no doubt require a restart, I don't think it really matters if the game's ruleset will be a bit different then what we have now.