Anyone who starts off telling you that they’re the most popular and trusted should probably not, in fact, be trusted. Especially if they’re calling for not using password managers. Passkeys are interesting in theory, but my understanding is that most of the implementations are just another way for big tech to track you.
I was on System 76 for two laptops. The most recent one, a Lemur, started to fall apart: the plastic hinge just started coming off in chunks, and the clamshell began to split. Customer service was terrible: they tried to get me to agree to charges without explaining what they were going to charge me for. When I pressed them (which took repeated emails) they finally admitted they wanted to send me a part for me to do a replacement without any instructions, and which they advised people not to do. Very scammy vibes. I picked up a Framework instead and have been really enjoying it, though I can’t really speak to the gaming portion I’m afraid. I’d just say avoid System 76.