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AMD's new RX 9000 GPUs only officially support UEFI systems
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
Nope, I've been running Win10 on multiple computers with a BIOS.
AFAIK, UEFI isn't technically a requirement. However, TPM 2.0 is, and that requires UEFI.
TPM 2.0 does not require UEFI. I have a system here with TPM 2.0 and only legacy boot support. And you can just buy a TPM 2.0 module and connect it with any board, that has a SPI connector.