This was my thought too. The price of a AP enclosure, for the quality product you get, is great. I can't justify spending $200-$300 more just to get something a few weeks faster. I looked into Kages and a few other places before putting in my first AP order and for the price I feel like I went the right direction with AP. I also ordered it well in advance of actually needing it, which I think is the advice I'd give to OP for next time. Personally, I think we're just spoiled with places like Amazon who will get you what you want next day, if you have to wait for something people lose their minds.
You're also right about AP being slow way before covid or any current supply chain issues caused by covid. They're a small family-owned business catering to a single hobby. They're not like say Central Garden & Pet that own Zilla, Aqueon, Kent, and Coralife, so they're in more than one hobby. They're only doing this one thing and, in my experience, when you have a company that only produces one thing, that thing is typically good. It’s been said here many times, you show your support with your money. If you're unhappy with the wait, product, or communication, don't buy from them again.
At the end of the day, AP is very transparent on the front end about the wait time. Its our responsibility to determine if we can afford the wait, and if not find other options.