Now what I am going to say is a my own take on the UI, but everyone has their own preferences.
I am not hating on the new UI but it looks quite cluttered or in simpler way to say would be that it is too distracting. Specially if you see on the 1st Image in the Unit Search menu, its taking too much of the screen for me to focus on the background image or in general case that would be the Archviz that the developer would want you to focus on. And if your focus was touchscreen now even though i am watching this on a monitor it looks cluttered imagine this on a tablet that a person like me who would like to focus more on what’s going on in the background rather than the UI.
Again this is just my personal take on just the UI, the performance is a different thing which would have obviously improved than the current AVE.
Now I am aware that we can modify the UI, but still changing it whole from the base makes it quite tedious, so my suggestion would be to also add a functionality to have the old UI to which the user or developer can switch to with the performance and functionality of the new improved one.