The issues in the 10.5 pro developed quite some time after. So it's still early to tell if they will develop on the air 3 to a significant extend like they did on the 10.5 pro... (and I see some people coming as every time saying they have no issues in their 10.5 pro after years, but nobody knows for sure how many are affected).
Having said that, do speakers matter to you? Because if they do, the 11 pro could be worth it even just for that reason for youtube watching. I think the 11 pro is a device that will last more than the air 3 and above all will hold its value more. There are rumors that the air 4 is adopting the 11 pro design, so in the future the air 3 might not be worth much in terms of resale value, while the 11 pro (with its narrow bezels, usb c and pencil 2 support) will hold much more value, even if it costs more...