my tinfoil hat theory is that they make small features depend on new hardware.

for example, let's say the new os depends on m5's exclusive thumbnail generator accelerator, and let's say it improves speed by a 20%.

now, your M1 notebook than on previous OSes uses standard gpu acceleration for thumbnails will not have this specialized hardware acceleration, it will have software fallback that will be 90% slower.

you won't notice it a first thought because it's stuff, fast, but it eats a bit of the processor.

multiply this by 1000 features and you have a slow machine.

I don't know how else to explain how an ipad pro cannot even scroll a menu without stuttering, it's insane how fast these things were on release