> Debugging lags is not really a stuff that power users should do.
It's the only way to identify the guilty applications/services/system configurations/etc
As another example Windows' Resource Monitor (from Vista onwards) totally changed my Windows experience. I used to struggle against bloatware, taking random shots in the dark. Thanks to the Resource Monitor I am now doing surgical and very successful strikes in no troubleshooting time at all.
Too bad there is no "bootchart for Windows" yet. Or isn't there? Autoruns is nice but just a list.
Any complex and professional system has monitoring features built-in. Why not smartphones too? They are certainly complex enough to deserve this.
> Android has something like it, it can estimate the power use by application. You can use various apps to view these stats.
These are averages - the opposite of latency measurements.