So what. Removing one of the largest sources entropy available for fingerprinting users is important. We shouldn't maintain the terrible long-term effects[1] of tracking everything just to help you have an easier time debugging.
[1] http://nymag.com/intelligencer/2019/02/shoshana-zuboff-q-and...
i ran this on my work laptop (windows 10 / firefox - mostly default settings). the "details" tab shows a full breakdown of each fingerprinting component with a "similarity ratio" (percentage of fingerprints that share the same value).
every entry is 20% or greater, most of them around 50% except for timezone (4%), canvas (1%), and user agent (0.12%).
so, yeah, user agents are still the largest source of entropy by a wide margin for fingerprinting scripts.