The above list includes the first 6 issues I have had with the new Evernote. There are other problems that have arisen since I made that list. But to your questions:
(3) Previously I could copy a file (e.g. a PDF) and paste it (via ctrl+v) into a note. For many months I could not do this and had to browse to a directory and attach the file (multiple steps). As indicated above, this has been fixed now in the Windows app.
(4) Fair enough. I happen to see it differently, especially as I often add tags at a later date for the purpose of searchability, not to change the content of the note. Given that it is a change, giving users a choice would be helpful.
(5) I have seen that contributors to these forums have had very different experiences. One commented on being in a country that doesn't have EN servers (I am in NZ, not sure it that makes a difference). Another obvious factor is the speed of the internet. This hasn't changed for me, and I use EN on 4G data as well as wifi. The change is noticeable before and after the new version, not in my internet provider. My iPhone is quite old (8) but apparently others are still able to use EN on version 6s and 7 (several have trouble on v.6). If my phone can take the latest iOS, which it can, I expect the app to be able to function well, especially if it's simply a matter of syncing data I also have shared notebooks and this has been a huge source of frustration to me,
Most recently I have had a terrible time trying to take notes on my phone. Whenever I pause from note taking, the screen goes back, and I turn it on again, or if I quickly check another app and return to EN, I frequently experience the loss of text. I have experimented with not tapping the "tick", tapping it once, tapping it multiple times. It seems to make no difference. Sometimes it also creates a copy of the note with either a blank title or with the title but no text. In short, it is extremely unreliable and frustrating. This seems to be worse in the latest version.
(6) The old version enabled one to install the (Windows) program where I install all my programs but simply move the data file (in my case, to an encrypted volume). There is no facility to do this any longer. Not a big deal to most people but it was significant to me for a period of time. Again, it represents a loss of features/functionality. I have used symbolic links on a Mac but my personal computer is a PC. My devices are iOS.
I hope this explains things more clearly.