Your statements made me believe the opposite. Though I wasn’t condescending. I said it was OK to not know.

Microsoft doesn’t say that. They state it adds to the security of your computer before Windows even starts. https://learn.microsoft.com/en-us/windows/security/operating-system-security/system-security/secure-the-windows-10-boot-process

Any device security is multi layered.

Having a mechanism that only accepts trusted boot binaries is pretty critical to fighting malware. Rootkits effectively have total control of whatever you decide to boot because of their persistence. When your hardware has its own security features (Secure Boot, TPM) why not take advantage of them to make the software you run more secure?

If you didn’t know, Android, macOS and iOS have their own TPM and Secure Boot implementations that have been enforced and present for over a decade.