I'm just one data point. Me being unimpressed should not be used to judge their entire work. I feel like I have a pretty decent understanding of a few small corners of what they're doing, and find it a bad omen that they've brushed aside some of my concerns. But I'm definitely not knowledgeable enough about the rest of it all.

What concerns me is, generally, if the experts (and I do consider them experts) can use frontier AI to look very productive, but upon close inspection of something you (in this case I) happen to be knowledgeable about, it's not that great (built on shaky foundations), what about all the vibe coded stuff built by non-experts?