I'm only a light user of office programs, both at work and at home. I have access to M365, but for my personal usage I prefer LibreOffice over MS Office, especially when it comes to spreadsheets. I generally don't mind the UI of the MS suite, but I find it's getting increasingly bloated and slow, and sometimes updates move UI elements around for no benefit that I can perceive. I haven't experienced the same with LibreOffice; it's lighter than MS Office I find it easier to find the options I'm looking for, which I know exist but don't always remember _where_ they live, because of the low frequency with which I use them.

With Excel in particular, there is something I can't put my finger on that I just don't get along with. It's unintuitive in a way that I can't describe, but which I notice about half the time I use it. Sometimes clicking doesn't do what I expect it to do, clipboard contents are lost all the time, scrolling resets or jumps around for reasons I don't understand. I don't have the same issues with LibreOffice Calc, which is why I choose it for my personal work. In fact, I think Google Sheets is the most pleasant to use of the options I've tried, which is something I thought I'd never say about a web-based alternative to a native app...

Regarding Excel's weird warts... Microsoft knows all about them but they're stuck with it for backwards compatibility. The business world has a billion Excel scripts and macros done by barely technical users that all inadvertently depend on the details of things like the scrolling and clipboard behavior. Trying to improve that would break all of that. Same as all the weirdness in JavaScript, Microsoft has to just call it a feature and live with it.