Plenty of fans do, actually.
Fangraphs has a rather large community that posts on their articles, all of whom buy into their advanced stat models. Heck, I’ve seen people citing StatCast data on Yahoo Fantasy Forums, where there is no category for exit velocity or barrel percentage.
Those type of stats are more popular than you realize.
In fact, I bet fWAR is one of the most popular stats for voting for All Stars, if not the most popular…