Devils advocate.

Workload dependence... average user... not significant:

A lot of users probably see "30%" and will assume the worst. There really isn't a lot of evidence of how much an average consumer will be affected. Pretty sure your average consumer isn't running pgbench all day. Hell, I'm willing to bargain 90% of servers (I really want to say more) are over-provisioned by 30% or more.

Mitigated over time:

Kernels are getting out safe patches ASAP, performance be damned. With more time to be careful, performance can be clawed back. And/or CPUs are upgrade and features such as PCID mitigate perf losses.