They market themself as standing for the open and free web and digital rights and privacy and what not. And then have the browser spying on every user by default with integrated ads.
So sure, you and me deactivate it, but a common person who just fell for the marketing and who does not even know what "telemetry" is, will have it enabled. The only reason I use their browser is, because there is no alternative - yet.
It is not transparent, if the information is hidden in the settings under a unclear name.
There is tracking also for ad purposes activated by default in firefox. A recent developement. Before the tracking was ocasionally and hidden under "studies". Firefox in its default settings spies on its users and sells this data to advertisers - that is the situation.
On the frontpage FF is advertised as privacy friendly and there is 0 indication that FF itself will also track you.
If that is transparent to you, than we can just agree to disagree.
Also Windows configuration is terrible.