Completely unconfirmed speculation incoming: There's a solid chance that the logic board is exactly the same on all of the Macs announced today and the only difference is the cooling solution. If you play around with the Apple Store configurator, the specs are all suspiciously similar between every new Mac. https://www.apple.com/shop/buy-mac/macbook-air https://www.apple.com/shop/buy-mac/macbook-pro/13-inch https://w…
If you compare the M1 Air and Pro, the only difference seems to be the addition of the Touchbar, 10% better battery life, and a "studio" speaker/mic on the Pro. https://www.apple.com/mac/compare/ I assume the addition of a fan on the Pro gives it better performance under load, but there doesn't seem to be a hugely compelling reason to not just get the Air.
So, the sustained performance might make quite a difference for pro use.