This is a key fault in your logic. You SHOULD NOT judge the alternative by how it supports the document format that is specifically created in such a way to block competition from effectively supporting it. The company that did it also corrupted the international standards organization to get it an official 'standard' status.
But the truth is, you don't really need MS Office document format support at all. The company I've founded in 2007 never ever sent out any document in MS Office format, never owned any copy of MS Office, and we survived since then just fine.
If you want an electronic spreadsheet, use an open, documented and well supported standard - OpenDocument, and get on with it. Oh, and it is supported just fine on Ubunut 20.04 that we discuss here, as is on a Mac and Windows. The only thing it lacks is a proper online collaborative editor, that's true.