taproot, which recently locked in, reduces the space needed to represent complex contracts.
moreover, bitcoin aims at being a concise and focused base layer on top of which secondary layers and sidechains can be built.
your absolute statement "exactly zero" is absolutely wrong.
Have you ever read the white paper that outlines what bitcoin aims to be?
Just kidding, it should only be p2p cash and it failed at that.
PoW/PoS will be replace by FBA in the next years and every system that can not switch away from PoW will become irrelevant.
... or even the title
Complex contracts? Are you joking? What kind of complex contracts do you think can be done on BTC? Their scripting language and capabilities has been neutered just like their blocksize. Good luck writing a useful contract on BTC.