If you look at Geekbench scores, it may seem like the performance drop is only 10%, but I gotta remind you that the M1 Pro with 10 cores, which should be 2x faster in almost every CPU task compared to M1 due to having 2x more performance cores, only scores about 12300 points, which is roughly just 64% faster.
So Cinebench scoring does not scale linearly. In reality, if you're losing only 10% in Cinebench, you may be losing a lot more.
My experience is much closer to this post here.
When the Air throttles due to the GPU-intensive tasks I listed above, the performance drop is closer to 30% or more. Fusion 360 and Room EQ Wizard both become noticeably sluggish, and the machine was very hot to touch.
I am not making any comparison with M1 Pro machines which are obviously in a different league. Nor would I claim that there aren't some usages where M1 Air throttling is more than 10% after 30 mins at max CPU, maybe especially gaming which I don't do and might be a usage where a cooled machine is more appropriate.
I am just picking up on the commonly made dismissive statement that M1 Air's throttle 'quite a bit'.
(BTW I didn't mention Geekbench, which doesn't load the CPU continuously like Cinebench does. Your reply above seems to equate Geekbench and Cinebench).