Yes, please do not mistake cynicism that X won't happen with a desire that X doesn't happen.
Exactly if Larian would send me a personal message saying you Terminator2020 decide if we should include all classes, subclasses and races from PHB to BG3 full release then I would say do it include them all.
However perhaps I am pessimistic about a developer comment that all subclasses and Cleric domains will be included this despite what one developer might have said a long time ago.
Pessimistic experiences examples in game development history?
A. Blizzard cancelled their next MMO project.
B. I am not interested in it but I know many people wait in wain for Starcitizen release date.
C. Cyperpunk 2077 despite there are people that like it I doubt nobody will say it fullfilled all the HYPE expectations. Well and yes I know that Cyberpunk 2077 patch 1.2 in year 2021 fixed many issues, but it still have lot of bugs and is very far from the HYPED super game of century it should have been according to the HYPE.
I do believe all DnD PHB base classes will be included in BG3 full release and hopefully also all races from PHB.