I wouldn't consider any of your criticisms as being "less accessible".

To take your example of the languages, the new design is more accessible. It has a clearly labeled heading, and I can see the names of the languages are being used without clicking on the bar. The old design has no hints that the striped bar (or in the case of `linux`, grey) is supposed to be informative. We're all just used to clicking that bar if we're curious.

It's clear they've optimized the layout around productivity, and making it more approachable to new visitors. Everyone has their preferences, and new designs are always tough to get right for everyone. "Less accessible" is the wrong way to phrase your criticisms, though.