I think the requirement for TPM (Trusted Platform Module) along with Secure, UEFI boot is going to be an absolute requirement, whereas the processor and other technical requirements may well be recommendations that will allow you to run, but "unsupported". The latter will become clear as more people attempt the migration.
TPM is quite an unpleasant one; AIUI, Win11 won't boot without it's presence, and it is likely to not be available by default on many Home machines. There are a number of possibilities:
1. TPM (or Intel PTT) is present and enabled, and the compatibility test will pass
2. TPM is present but not enabled - BIOS settings should fix that
3. TPM is not present, but there is a header to which a TPM module can be attached and enabled in BIOS. If the option is available, it's relatively simple in a desktop, possibly less so in a laptop (They used to be fairly cheap, but scalpers have preempted the demand, and current availability is low, and prices high)
4. There is no TPM capability possible, so WIN10 it is.
Most reasonably recent machines (we're talking a good few years) will be UEFI secure boot capable, but may not be set up that way. BIOS changes will correct that under many circumstances, but (depending on Microsoft's mechanism) may complicate migration.
My older laptop isn't, I think, going to get anywhere near Win11, my NUC should qualify as is, my desktop will need an add-on TPM module (they were about £10 before the scalping) but the processor currently looks like it won't pass official qualification.
FWIW, bets are being placed on Microsoft removing the TPM requirement as it is going to be a pain for the average user. It's certainly possible, but I think a desire to move to a more secure state will probably win out.
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