LibreOffice is probably about 10% of the size of MS Office these days...
As for instructions/support: Changes between subsequent versions are minor. There was a versioning scheme change recently, so you may be thinking "Oh, LibreOffice 7.3 vs 24.8, very different" - no, mostly the same thing, it's just that 24.8 came out in 2024, in August. Also, there is ask.libreoffice.org #libreoffice on irc.libera.chat , and there are Telegram and Matrix channels... so just ask.
But it's true that with 0.1%-0.5% or so of the budget MS Office gets, it's difficult to keep all of the materials fully up-to-date.
Don’t forget I was replying to a person who is using Office 2003 and not paying as they probably paid their once 20 years ago for license and also don’t have any new features.
But pretty sure it's not worse than Microsoft. I'd rather burn my money than spending it on Microsoft "products".