It is extremely useful if your work ends up in paper. For photography (edit: film and broadcast, too) would be great.
My use case are comics and illustration, so a self-color-correcting cintiq or tablet would be great for me.
If it looks good on a mac laptop screen/imac and the scopes look right, it’s good for 99%+ of viewers. You can basically just edit visually off any Mac laptop from the last 10 years and you’ll probably be happy tbh.
Light grey text on a white background looks good on a Mac, but pretty much unreadable for most users.
With more people being remote, this either doesn't happen, or is much more limited. Support teams have to repro issues or walk through scenarios across web, iOS, and Android. Sometimes they only have their own device. Better places will have some kind of program to get them refurb devices. Most times though people have to move the customer to someone who has an iPhone or whatever.
Audio engineers are for sure taking all this into account, and more (: