It's not legacy code until the day Apple definitively axes Intel models. The writing is on the wall yes, but they are still selling Intel Macs and they are not deprecated yet. The majority of development still happens on Intel Macs.

I built an 11th-gen Rocket Lake 128GB Hackintosh with Thunderbolt Display support+2 LED Cinema Display recently and it's been great. Thunderbolt 3 support on a Hackintosh has been nice. Just hoping for Thunderbolt 4/Maple Ridge drivers/11th-gen iGPU drivers if ever.