How did we get here? It seems in the late 90s/early 00s, we did tons of usability studies and formed our UIs and UXes around the results. We wanted to appeal to everyone.
And now, we've thrown it all away. Functionality is hidden. Discoverability is considered ugly and cluttered. Usability is thrown out the window in favor of something that looks "sleek" or "clean".
I've personally decided that rejecting a design purely because it's "dated" and not on any technical merits is evidence that you don't know how to think for yourself and just follow trends, whether they're good or bad.