There's also something to be said that "a blend of road and mountain" applies to road bikes as well, much more so than in the past.
Road racing bicycles now have hydraulic disc brakes as standard, wide range cassettes and their long cage derailleurs, typically smaller chainrings than were previously available, often 1x is seen, much wider tires, tubeless tires, and so on.
Enthusiast bicycles, in general, are more "hybrid" across the board than in the past.
Your box-stock road racing bike that has 700cx32mm tubeless tires, disc brakes, 11-34 cassette, 50/34 chainrings, long seatpost, is a hybrid.
In a strange twist, every bike is a gravel bike and every bike is a hybrid.