All very true. Collaboration with other editors and freelancers is a key for everyone that isn’t working within their own sphere. Depending on the market and/or market segment, that’s still either Premiere Pro or Media Composer.
Much the same applies to audio. If you are a mixer with experience and have an investment in Pro Tools, then Fairlight won’t convince you to shift – generally for the same reasons.
Resolve is a great companion workflow tool in addition to being a good color corrector. For some, it’s becoming the primary tool. But I highly doubt that number of users (as editors) is close to that of FCP.