Windows 11 on an unsupported PC: is it worth it?

It is possible, but Microsoft does not support it.

Which requirements fail most often

TPM 2.0, Secure Boot and older processors.

Check the BIOS first

Often the options exist but are off: how to enable them.

If the hardware truly does not qualify

Workarounds exist, but updates are not guaranteed and stability may suffer.

Effect on your licence

Activation works, but you carry the risk of update problems.

Alternatives

Keep Windows 10 for a limited time, or replace the PC.

When a workaround makes sense

A spare PC or a test machine, never your only work PC.