I would much rather see then the full release date added as a second entry into Release date field with a flag (EA or Full Release).
For me it´s vice versa - I am not interested in EA releases, those are arbitrary, but rather once the game is feature complete & relatively stable.

That typically means way after 1.0 though.
I go further than that, generally interested after end of development, so the game's as complete and patched as it's going to get, no risk of falling behind on updates, or of an update breaking something or making old saves incompatible or affecting my strategy or development plan, or content being added that may require restarting, and knowing that when I'm done, I'm done and can move on, without possible new content coming after that and turning a game I thought I had completed into one that I no longer did.
But still, the moment a game becomes available to the general public, in whatever form, is clear, that's not arbitrary, so might as well use it for release date.

That makes sense and I can see where it´s coming from, however EA games are, by definition, incomplete and can change drastically upon release (complete overhauls of some mechanics in Darkest Dungeon, or the whole game - Subnautica, for example) - not to mention many devs are exercising their right (and I understand why and it makes sense) to not keep EA save compatible with those from 1.0 (some of them do huge update just before release, allowing people to start over and transfer their save prior to release from EA to full game, but that´s an exception).

That´s why I still consider 1.0 as important release date - game is feature complete, usually is well optimized (especially after long time in EA) and devs are making a statement "this is a state we intent to release it in."

That you are waiting till the game is at it´s lifecycle´s end - that I can understand (sometime it takes me so long to get to a certain game that they release a remaster of it, or some anniversary edition :D), makes sense, because on top of what you wrote, there´s a huge mod support over time and you can choose to modify some aspects you don´t like, etc.

review

https://www.youtube.com/watch?v=dZ1abyawVhY