Now I'm puzzled by the apparently biggest obstacle to implementation of this feature: possible misuse. I love ruby community, but sometimes saving the dummies' asses goes a bit too far.

This is hard because Apple does not want you to and a failed installation might render the ipad useless.

Moreover, React team even removed the “highlight updates” feature from dev tools because people used to obsessively haunt wasted renders with no reasoning behind it

I understand what you're getting at, but we shouldn't miss out on useful features just because a few developers will abuse it...