I think you're right again with the last sentences. They won't be such discussions if "the waited game" wasn't named Baldur's Gate 3... Except many wouldn't understand why it's not named BG3.
But what we see and what they say about it looks nearly nothing like a Baldur's Gate game... That's why I'm dissapointed. (please don't say I waited for a game of another ages etc... This is not the point, and this is not true).
There would likely be some complaints still, but not to the degree that is currently being seen. The main problem is that people are currently making these conclusions without all of the evidence.
What we have right now may look to some more like DOS than BG, but as mentioned by numerous posters and Larian themselves, this is pre-alpha with little to no context, using placeholder assets and without a deal of the content being finalized.
Even when the game is finally released in an alpha early-access state, it will still be utilizing placeholder content, characters, quests, art, gameplay, etc. will still be under development and subject to change.
From what I've gathered the development steps are to 1.) Lay down the lore, narrative, get a plan together, 2.) Get the game in a playable state so that systems can be tested. 3.) Get maps, quests, races, setting and art constructed and slowly implement into the game. 4.) Finalize content and begin polishing. 5.) Release
What we've seen is still at step number 2. When the early access is released, it will still be step number 2 with some of step number 3 being done. Meanwhile step 5 might potentially look like an entirely different game than what was just shown.