Out of curiosity what’s the problem with ksuite?

I’m still on the hunt for my google docs replacement, currently I’m testing OnlyOffice Workspace and MobiOffice. Was thinking about giving Collabora (I like LibreOffice a lot, but I need it to be accessible at least via browser) or Ksuite a go as I’m having some crashing/slowness issues with MobiOffice when copying complex formulas across more than like 10 rows/columns