The UI for Acrobat Pro DC is absolutely horrible and non-intuitive. It actually takes me longer to do everything because I have to click into multiple areas on the screen instead of just the sidebar (e.g., to recognize text, I now have to mouse into the side bar, then move to the upper bar).

That also assumes I can find where the feature/tool now resides. I have to constantly search for it.

The Save As dialog breaks Windows user training and muscle memory because the big blue button is not “Save” or “okay” as expected. It is “Choose a Different Folder”. I keep accidentally opening a browse window I don’t want (I am just reducing file size, not renaming, etc) because it is not obvious you need to select the file name above in the list of recent files.

It is like you took the worst features from Office365 navigation and dumped them into your product.