Because you don't have to?
D&D exploration is so bad a half caster can do it.
It's all low level except for Stealth, Detection, and Lock Picking. The only thing that really progresses is Tracking and all it does is open up options to be lazier.
The druid is also better in combat situations and has more utility. If your argument is that 5E is just face rolling easy, that still doesnt mean the ranger isnt weak compared to other classes.