All the icons are lined up front and hard to distinguish; some bugs are really annoying (animated transitions don't work on my computers); some functionalities are tough to find : grouping/ungrouping for example.
If only I had time, I'd work to fix that...
UI preferences are a matter of taste and habits. I find PowerPoint ui a hot garbage mess where I can't find anything, and LibreOffice is logical and structured to me. So my mileage obviously varies.
Anyways, presentations are supposed to grab attention. Nothing grabs attention better than an animation.
As a person who regularly reviews students presentations, I tell you this: these "grabbing attention" gimmicks achieve nothing but irritate the audience. If you rely on it, you better think again, how to grab attention with your presentation contents.
Don't believe me? Ok. Check any of the presentations that had successfully pitched projects to VCs. None of them will contain any "attention grabbing" animations. Example: [1]
[1] https://medium.com/@gc/the-beginning-of-uber-7fb17e544851