Yes. It is OK to remove the unwanted fonts (I do).
And LibreOffice will annoyingly install them again with the next update.
All the new useless fonts included with LO6 just make this problem that much more annoying.
Also annoying when an older version font is installed over one you have already installed.
There have been multiple requests to allow users to opt-out of installing certain fonts.
Has not happened.
I’d settle for just the option to not install any fonts (like many other applications do).
That way once you have cleaned-out all the crap you don’t have to do it again, over and over and over.
I guess the LO usability guru feels that Ray-the-moron (LO primary user persona) won’t notice the mess.
.