Riot why Teemo shrooms cant last 10 minutes?

Teemo got buffed this patch because they gutted him previously mainly by reducing his mushroom time duration to 5 minutes from 10 (Which is huge and partly because of R arm time yes they did give him some useless/noob bait tricks to compensate..)

R - Noxious Trap ARM TIME 1.5 seconds ⇒ 1 second COOLDOWN 35/31/27 seconds per charge ⇒ 34/28/22 seconds per charge

Why cant shrooms just last 10 minutes?

By reducing the Arm time on R he can poke with His shrooms in teamfights now (Since the range is big)instead of setting them up ahead? Teemo was never about POKING WITH MUSHROOMS

Its nice that shroom cooldown is getting reduced BUT WE want the shroom duration increased

Ask any teemo main what he wants and he ll be simple and say I just want shrooms to actually last again

The solution is simple BRING BACK SHROOM DURATION TO 10 MINUTES

Why does riot have to COMPLICATE IT=? They are risking by reducing his r ARM Time since Teemo strategic shrooms ll because ranged poke And the cooldown buff is something but it just compensates like 10% of shroom duration nerf