Hmm... my experiences differ from yours. I find LibreOffice's styles very useful and predictable. I have 100+ of my business templates in Writer
1. F11 to pop open the Styles and Formatting sidebar (undocked is my preference)
2. Use Ctrl+M to clear direct formatting.
3. Keep a master template of styles to re-import into the others to ensure uniformity. (Make sure to check Overwrite or you're wasting your time.)
4. Don't confuse paragraph styles with character styles. (Use Page and Frame styles for extra credit.)
Of course, NO word processor is going to do layout like a true graphics workhorse like Illustrator, InDesign, Scribus, or Inkscape. If you are looking for 1200 dpi accuracy, LO is the wrong software. But if you're looking for general office functionality, I don't know anything better, free or not. (And my first word processor was Claris MacWrite II about 1989, with long stints of WordPerfect and Word up until 2013 when I went pure OO.o/LO.)