I honestly find MS Word extremely difficult to use. Like, I'm always fighting against the incorrect assumptions it's doing on my text, and against an unknown amount of invisible state that changes my formatting as I type.
But I consider it to be a timesaving tool that's more advanced than regular LaTeX. Often you don't need to deal with the fiddly bits, but you still need to understand how they work. Especially if you get a compilation error (er, typesetting error?). They're much rarer with LyX, but because simple problems (e.g. missing brace) are impossible, when you do occasionally get one it's bound to be a doozy! Plus when you need a LaTeX feature that LyX doesn't support natively (rare but inevitable) you still need to know how to write it in LaTeX plus how to use LyX's math macros or modules language if you want to make it seamless.
I think this is why LyX struggles to get a big user base. Beginners end up getting stuck and going back to LaTeX. Advanced users see it and think "I don't need this – I already know LaTeX!"
Really clever project though, and I hope there are a lot of people whom it does help.
See a marginally relevant xkcd here: https://xkcd.com/2109/
You can see roughly what you are doing while writing, which makes some things much easier. Especially typing in large formulae (and double-checking that you didn't make a mistake). Although the way you enter them is more typing than point-and-clicking.
For something like changing how the chapter titles look, you are pretty much back in the world of Latex, trying out some macro to change all of them.
https://www.lyx.org/
Lyx is so useful that I am sometimes amazed it is not more popular. All the power of LaTeX with the ease of use of MS Word. And free and opensource. What's not to love?