Very little sympathy for WordPerfect, sorry
Look, I'm against MS as much as anyone else, but I have actually used and (misguidedly) tried to persuade other people to use it. The DOS text-mode version was ok. The transition to Windows was just short of a complete pile of crap.
The Windows version didn't seem to really understand such concepts as a WYSIWYG, discoverability, allowing users to develop and use common skills across applications, etc. In fact, I dare say that WP for Windows was the original case of WYSIWTF.
Such concepts as using DDE or later OLE to deal with foreign formats was also one thing that every nerd was trying to fight off back then too, and IIRC WordPerfect missed that too. Well, guess what? "OMG, embedding videos in text files is dumb" wisecracks are easy, but people actually appreciated embedding any random format of a picture or diagram without worrying about buggy converters or whether such converters exist at all.
Briefly, they had their DOS version, and tried to just port that to Windows. Badly.
Let's face it, while MS _is_ a monopolist, and should pay for any wrongs they did, you don't go from market leader to nobody in free fall, unless your product does suck by comparison.
WordPerfect had a _tremendous_ amount of mind share and brand recognition, while Word was relatively the upstart. Plus everyone already had a ton of documents in WP format, clients sending them documents in WP format, etc. People are willing to forgive a lot of minor flaws of WP or minor advantages of Word, in that kind of a situation. It's normally a slow and painful decline, if at all. To lose them hand over fist requires a major screw-up. And IMHO WordPerfect for Windows was just that: a major screw-up.