You seriously think they haven't done anything since last E3, almost 1 year time ? I highly doubt that. I bet they did a massive job improving mechanics according to peoples criticism.
What? Hell no, I think they've progressed a lot in development. But when it comes to criticism, in these months I tried to understand what we are criticizing.
The major feedback is that a lot of people want TPP and that's not going to happen because that would mean to rethink the game entirely (animations, motion capture, camera and dialogue system).
Other feedbacks are about loot, but 2 visions can be found: some people don't want a looter-style game (like diablo, looter shooters and TW3)(I'm one of them), other people want exactly that or even more junk for crafting in fallout/TES-style. Demo showed something weird: armor had levels, weapons only rarity. Every enemy killed dropped loot like in TW3. At least no level-gated gear was seen. Who are they trying to make happy? We don't know, it's not a clear one-direction feedback, but what they showed was already pointing in one direction, if 50% of the players are happy, CDPR is happy. They can't make everybody happy.
Some people asked for more contextual animations (i.e. me), but others say they don't want animations because they didn't like RDR2. Again, what CDPR understood? Demo was perfect or more animations are needed? Again, if 50% of the players are happy, CDPR is happy.
Another major complaint is about levels, the vast majority of people complained about them (both for CP2020 lore and fear for bullet sponge enemies like in TW3 and looter shooters), but a lot of people didn't say anything because they firmly believe that levels are fundamental in RPG and their progression system (which is not true). I'm pretty sure they're not gonna remove levels from the game, at all (unluckily for me).
Some think the game needs a more realistic approach when it comes to perks and cyberware (a subdermal grip that increases bullets' stopping power is pure magic), some may like that "because RPGs work that way".
Double jump was another main complaint, but they said it's justified somehow (some gas-propelling system I guess)
Other people are asking for impossible things like making the game an isometric turn based RPG and of course that's not gonna happen.
The point is that the general feedback is that the demo was great, but had some flaws which - unluckily - are extremely subjective. Therefore I believe CDPR has decided to continue for their path and minor changes will be made during beta testing for what concerns game's mechanics (like balancing weapons and HP bars, stuff like that). Probably they will add HUD color customization, FOV slider, head bobbing and other minor things which require zero development time, but nothing "serious".
Maybe, and I say maybe, they realized some things made no sense and changed them, but that stuff is so obvious that thinking they didn't know it from the beginning is offensive.
TLDR; the vast majority of feedbacks were in contrast to each other, so I think CDPR kept going on since the general opinion is that the demo looked great overall.