Attractiveness has always affected opportunities afforded to people and other people’s perceptions of you. This is not just in tech. Hell, it influences elections! This is just human nature and has been studied extensively. It’s just trendy to bash Silicon Valley for this, because, you know, everyone on Wall Street is wearing suits for the comfort factor...
However, I think there’s an upper bounds on where that matters, and I think it mostly matters when climbing the corporate ladder. If you look at the richest men in the world, most are not supermodels.
The moral of the story - if you want to play the game you have to play by the game’s rules. Otherwise, play a different game.