> Sometimes the work of the core developer is to say "No" to his own code.

Thank you for the careful sentence.
For clear the air, I never think that my patch should be accepted.
This is why I always get reviews from other core devs and I always accept the review result.
(You may know my a lot of rejected PR ;))

but for the future record, we always record why someone tried this and why rejected(e.g why not worthed to do it)
so this is the reason why I talked about why I tried this optimization.

In the future, if someone submits a similar patch we can give this issue to them.