It is not at all simple to "opt-out" (i.e. remove malicious software).
I checked the box "no telemetry" on install, yet I still had to disable dozes of spyware "options" manually later. One of them was a keylogger! Microsoft is in the black hat business.
> telemetry can benefit product teams
Pure marketing. If product teams what to know about issues, how about setting up decent bug-trackers like everyone else?
Reporting issues is a convoluted, humiliating and mostly futile process.