And most people aren't doing anything remotely close to requiring the "latest and greatest" processor. All of these benchmarks are great for us nerds, but it's hype. A lot of Apple customers want to know they are buying "the best", even if they have no practical need; the company has always been half lifestyle brand.
There's also a cost angle; Intel laptop chips are quite expensive.
There is a market for $1000 computers that is serviced by Apple, Lenovo, HP, etc. If Apple can improve their offering over their competitors then you would expect their market share to increase.
Most people don't want to pay that much money for a computer.
I can't afford a Ferrari but I'm under no illusion that the supercar manufacturers aren't fighting over the same customers.
another area is that apple for years shunned gaming on their Macs either from API changes or lackadaisical driver support to the point of having a riff with Nvidia that was never solved. that reduces the appeal on the consumer side as many did not or count not afford multiple machines and of course upgrading a Mac meant buying a new one
So now they have a really good processor, we need to wait to see what they drop in the dedicated GPU realm to go with it, and finally how they encourage all x86 vendors to come on board.