Of course you have a limited field of moving. That is called zoning and is exactly what they are supposed to do. ô.o
And about the Jhin traps: you have to think a bit outside of the box.
Jhins traps are invisible for the enemy. So your allies can lure them into them, CC the enemy in the trap.... and you helped them with great burst damage while not being present.
Now look at Caitlyn traps. Let's say you placed them to help your team and then move away. The traps are visible. As long as your enemy is not blind, there is no way they are stepping in them. No benefit for your team member. If you want these traps to be useful, Caitlyn has to be nearby so she can
- place them reactively for chain CC
- AA the enemy for the additional headshot.
Jhins traps create benefit for his team members even if he is not in range. Caitlyns traps don't.