Very cool.

I love that as a new user I can just jump right in without creating an account.

This article conflates roles a bit. You probably want both designers, a visual designer who is concerned with the aesthetic of the UI, and an experience (or information) designer who engages in problem solving, and understands how to effectively convey information to users. If you're lucky this might be a single person, but that's not always the case.

It's likely if someone is looking for help with, say, Accessibility, that they are interested in both the tools and plugins for this topic. How about showing all the tools and plugins within a category on a single page. You could visually distinguish them on the page (with an icon for tool, and another for plugin), or separate them into lists with a heading for each.

I still use it for quick access to the calculator, but not much else

Cool idea, I've done time-lapses like this with screen recording software, but it was pretty tedious to edit.

We'll need another loading spinner while the user loads the 135KB Lego loader animation.

Press and hold the left mouse button and move the mouse cursor in a circular motion

I haven't had keyboard issues, but the touchbar is incredibly useless

I found that if I got a match, I could keep clicking cards and they would stay open.

Personally I've heard the expression that feedback is a gift, but I would imagine it's meant in the abstract sense that you should be thankful and accepting of it, not the literal sense that the article suggests.