Yeah... I mean, I did hedge by saying "depends on your CPU and your risk profile", but I understand your point and will edit my comment to caution readers before playing with foot finding firearms.

From my understanding it's a mixed bag. Some of those vulnerabilities were little more than theoretical exploits from within high levels of trust, like this one. Important if you're doing a PaaS/IaaS workload like AWS, GCP etc and you need to keep unknown workloads safe, and your hypervisor safe from unknown workloads.

Others were super scary direct access to in-memory processes type vulnerabilities. On Linux you can disable certain mitigations while not disabling others, so in theory you could find your way to better performance at a near zero threat increase, but yes, better safe than sorry.