To me it feels like they sacrificed functionality for aesthetics. It's not the right trade-off to make for a professional tool. I don't want my Github feed to be Facebook-like. I'd rather have it be compact and useful. A feature that'd let me browse by "topic" (e.g systems programming) regardless of language would be welcome as well.
In this update, the three culprits are the font-size, the spacing (so much space wasted) and the (slow) auto-load. It wasn't great before but this is most definitely worse.
Dear Github, please make technology discovery efficient rather than pretty. I spend hundreds of hours on your platform. You could save me a lot of time focusing on the right stuff.
It's a shame because there's so much potential there.