I just looked up the definition of excel power user, and it’s mostly stuff I deal with on a daily basis, so I guess I’m a power user.
That being said I am switching to libreoffice currently because I’m tired of proprietary bullshit. I also like the idea of being able to change libre for my needs if I want. I haven’t seen any degradation other than a rough around the edges UI. What is libre lacking that MS has?