But they aren't saying they will blindly follow the telemetry data, just that it's an important factor.

You need to determine which feature to add:

1. One that 3 developers asked for

2. One that 6 developers asked for.

With telemetry that can become:

1. One that 3 developers asked for and can improve things for 60% of your userbase.

2. One that 6 developers asked for, but only 12 of them are using the function that it will improve.

Without telemetry data, you are playing with an arm tied behind your back.