This is a fascinatingly coercive take on the privacy / observability tradeoff.

No, this is supporting direct feedback. How can mozzila know which features are useful in your opinion? how should they know that you wanted [feature X]?

Maybe they are also in the wrong if the telemetry is excessive, but the alternative is to never deprecate any feature ever.

They could ask.

Ask who? Power users? Then the only signal they would get is "every feature is used by everyone". That's worthless 'data'. Telemetry is the only way mozilla could possibly collect real data.

And receive answers like, "A faster horse."

They could ask slightly more focused questions than "what would you like?".

Better than keep removing features and reasons to use Firefox from some of their loyalest users, even if they are a minority. User retention seems Mozilla's largest issue at the moment now they're down under 10%.

Telemetry can tell you which features someone uses. It doesn't tell you why.

Then perhaps you can see why using telemetry is irresponsible.