To be quite fair to Peter while he is showing the positive outlook on all this from his side, I think he's earnestly showing his side of the story. He's unaware of the best or "proper" way to solve a lot of these issues, he's learning as he goes, and while sometimes he acts incredulous at the need for certain tasks he does eventually seem to do them and it seems he tends to come away from those experiences satisfied in the outcome having been worthwhile.
His positive outlook lately has been strained by all the reality catching up, the things he's learning, and I think bit by bit he's starting to get some of it just by being faced with the bill of it all. The lack of experience and knowledge really clearly comes through when seen from the Wasabi video, but it makes plain that he's not so much intentionally hiding the bad stuff, because he simply doesn't know what's bad and should be hidden.
When he has all these deep complicated explanations for how certain things that should just work all have their certain way of making it work, it's clear he's worked it out in his head that it all makes sense and that specific thing might be slightly odd but it works fine; but I don't think he has taken the moment to step back and reflect on all of those quirks in aggregate and whether they add up to the type of machine someone wants to jump into. He's gotta explain every little thing and justify it. He doesn't see that as an issue cuz he has lived with all this knowledge for years. And one or two quirks is probably fine. But everything here has things that just don't quite work right, and so while it works-ish. it's all clearly half-finished prototype stage solutions. And in retrospect when there's a better design worked out (hopefully) he'll clearly see how far he had to go.
But that's the future.
But somewhere I think he knows there are big gaps in his personal experience, which is why despite all of his hubris at times, he still knows enough (I want to hope) to continue to defer to people with experience and real critical eyes when it comes to flying the thing, and has to have inside his mind at least a bit of the real concern that the creature may bite.