The data being collected is meant to enhance the appeal of Firefox as an ad platform for customers who might want to buy paid placements in Firefox Suggest. Perhaps they also consider it useful as a trial balloon to test the reaction it gets before heading further in that direction. The reaction it gets will not be good.
Looks like I may finally be trying out Librewolf.
I find Firefox ESR much more relaxing to use than the version that springs new features and bugs on you randomly throughout the year.