What's with all the new colored vinyl?

All that matters is the quality control at mastering and production.

Natural pvc has no colour, additives and black carbon (has conductive properties also) strengthen the lp and make it black and in the long run it would probably last longer. Colouring is a dye nothing more but pleasing to the eye and give a nice alternative, making more desirable some releases. True with clear and coloured ones imperfections are not easily noticed but sonically are equal to the black ones.

I would avoid, for sound quality only, the pictured ones being the thinner.

The main concern for most of the companies that sell records is how many they sell, definitely not sound quality, except for some small labels. If coloring the vinyl sells more copies, they’ll color the vinyl.

Wouldn't it be nice if every band on a record side were a different color so we'd better know where to cue up the needle? Or how 'bout if the vinyl between cuts were a contrasting color to the rest of the side?

All in all, though, let a thousand colors bloom! It's the music and the quality of the vinyl/pressing that counts,

I was not talking about young people's music or picture disks. I mainly listen to and collect adult music (Jazz and some Classical and Blues) and I stopped buying used records years ago. It's too much of a crapshoot. They're mostly visually graded and one person's Mint Minus is another's VG, and you never know how they've been cleaned (or with what) or treated.  I've found many reproductions from Impex, Tone Poet, Mo-Fi, Analog Productions, Craft and others to be superior to the best originals and way less expensive. I just see no reason for them to color the vinyl except maybe to differentiate it from the original.