Agree with your post, but something I see brought up a lot that is a bit irksome is that people seem to give the 80s X-books much more credit than they deserve in regards to the representation of characters of color.
Uncanny was basically just Storm with some occasional appearances from Sunfire and Stevie Hunter, neither were a permanent fixture. Jubilee didn't show up until '89.
New Mutants was the best of the three, but Karma got pretty immediately sidelined and never really stuck around long, leaving just Dani and Sunspot for most of the 80s. There were more white blonde haired blue eyed characters than there were characters of color.
X-Factor had Rictor, and some small appearances from Opal and Charlotte Jones.
Excalibur was all white.
The X-books didn't really start doing a somewhat better job until the 90s, and even then it could be better. It could still be better, not only in terms of characters but creators as well.