Manaless Champs/Certain Junglers & Riven
Don't reward you for dominating your lane against them.
Jungle Example 1: I'm completely destroying top laner, I'm blue side. I have a control ward in the river brush and a regular ward in their tri-bush. Next thing I know... screen goes black, I'm dead. Hi 
ol buddy ol pal.
Jungle Example 2: I'm blue side top laner again, with control ward in river brush and a ward in their tri-bush. Minion wave is in the middle. Next thing I know, I have to 
under my turret and recall because 
just appeared out of the middle bush top side. She walked from their tri-bush, past my regular ward, to the top of lane into their bush and across, then next thing I know she's on my face, no exclamation point warning.
Manaless Example: Laning against 
who is literally face rolling his abilities every 4 seconds or so and the thought crosses your mind, "He should have been out of mana like 10 face rolls ago." So now you have to recall even though you're winning lane, while he's still farming because you have a mana pool to manage. It's even more awkward when you were initially denying his farm, up 15 cs and half a level of experience. Short cooldown timers on these champs, no resource to manage, good damage, all wave clearing abilities with burst are high damage ults, stuns, slows, mobility, the works.
The 
Example (she also fits into the manaless spammer category as well): So you've destroyed Riven's turret, won a trade against her and... her flash is down. You playing as Talon have on 
and Riven is bootless with a 
... why for the love of God, can I not catch her. Oh yeah, because she's a champ with no resource so she's spamming her Q combo and E to create more space. Poor Talon never catches her. I could have gone with 
, but that item isn't effective because if a minion tickles me, I slow to a crawl.
Same concept applies when trying to catch 
(slow), 
Q, 
W, 
WE, 
.
And non mana champs but have an infinitely refillable source 
