It's not impossible but extremely difficult to make an office suite, it's also probably one of the most boring things to do. Libre office is one massive incomprehensible pile of ancient rotting c++ and java code dragged along over 38 years (staroffice). You can imagine how nobody with any sense of UI/UX or people who write for a living would ever touch it let alone dedicate their free time working on this mess. The self selected people left to work on it are very apparent in it's esthetics and everything, or lack thereof. What's left are FLOSS enthusiast's, but that doesn't make a competitive office suite.

Blender on the other hand has a massive community and dedicated leadership who pour every last bit of love and soul crafting this software, that gets significantly and noticeably better every few months.