A lot of people compare what we got to the 2018 demo. And a lot of people seem to think that the "subject to change" is a valid defence in favour of CDPR, when it comes to accusations of false / misleading marketing.
A reasonable gamer might expect the final product to be changed over the course of development. But by "change" gamers tend to imagine the presented mechanics are fleshed out, expanded upon, less buggy, more flashy... not removed completely with a hacksaw. We've had games downgrade visuals to match expected performance levels and such... and it's always met with criticism (the bigger the change, the bigger the criticism). Essentially - it's a matter of scope and perceived change "direction".
Change features for the better and no one will be angry; in fact people will be happy that you delivered more than you advertised (under promise, overdeliver). For example the overall quality of visuals seems to have been improved since the 2018, and that's a plus for CDPR.
Change features for... something different (but of similar quality), and while some people might be a bit angry, the general consensus will likely be that it's OK, provided you come clean about such changes prior to release.
Change for the worse and people get angry - the more you change for the worse, the more angry people will get. Unfortunately for CDPR and the 2018 demo, this is the most common case, with features removed left, right and centre. Inspections, trams, spider bot, character creation choices... all hacked away from the title. Takedowns, significantly simplified. Crowd density - lowered. Plenty of things the narrator taunts or promises - missing. Any one of these things changed for the worse or missing would still get some people complaining, but in the grand scheme of things wouldn't probably matter. But when the scope was reduced so much, then it starts to be a problem.
And here's the best part... For a moment, forget about the 2018 demo. Forget about the 2019 demo. All you need to do is focus on all the pre-release 2020 marketing materials (trailers and Night City Wire episodes especially) and it's easy to find things that are misleading JUST THERE. No matter how you look at it, CDPR's marketing for CP77, compared to the final product, seems grossly misleading.