But at least part of that resistance was the tech version of Stockholm Syndrome (
https://en.wikipedia.org/wiki/Stockholm_syndrome). They didn't love WordPerfect because it was better than Word, they loved WordPerfect because
it was what they already knew and
they had invested a lot of time in learning its idiosyncrasies. Moving to Word meant throwing all that learning out and having to start learning all over again, which they (quite naturally) didn't want to do. But none of that means that WordPerfect was a superior product; it really wasn't, especially for new users. It just means that people who were heavily invested in WordPerfect -- and there were a lot of those people back then -- didn't want that investment to have been for nothing.
Microsoft addressed this issue quite effectively by providing a mode in early versions of Word that supported all of WordPerfect's key bindings. This let those hard-core WordPerfect users ease into the new application without having to learn a whole new way of working. Over time they discovered how much easier it was to use the mouse and WIMP interface, so the WordPerfect compatibility mode became less and less of a selling point. But at the beginning it was absolutely crucial to selling Word into organizations that had been bastions of WordPerfect use.