There's a massive and increasing incentive in Diablo to bot. Back in season 1 I peaked at high 300s on the U.S. Wizard leader board with a 38 grift. This was using old firebird with an average furnace, and c300 para levels.
Getting the gear for that build took a time investment but one I could afford playing pretty casually.
Since then Diablo has introduced ancient items, Kanai cube (especially calds despair), ramas gift and massive XP inflation. All features weigh directly equate time spent with character power.
Going back to season 1, everyone more or less had access to the same gear, the differentiator on the leader boards was skill and luck. Now time is equally as important.
I'd like to see design choices in the game which make botting relatively less attractive, but track record over the life of ROS suggests this is unlikely. In the meantime, I'll continue to bot so that I can enjoy everything the game has to offer in the limited time I have available.