Earlier quoted context omitted.
Eeven 0.1% scaled accross all users is a huge amount of wasted energy. You can profile without subjecting everyone to frame pointers.
Not nearly as much as the missed optimizations from not having this easily available.
[citation needed]
That's just the same handwavey reason as given in the article. Where is the evidence that this will actually result in any significant amounts of optimization that wouldn't be possible without making everything (slightly) slower for end users.