Kog'Maw has had visual clarity issues with his R projectile for a long time. The indicator on his base skin is a thin green line with tiny reticles as an indicator. Even the indicator on battlecast Kog'Maw which many consider pay-2-lose is shaped nothing like the actual hit-box of the ability. All of the above screen shots are zoomed in, and for the base indicator, are even harder to spot on the green terrain of summoners rift. I imagine this is even worse for color blind players.
I wouldn't mind if Kog'Maw was given compensation buffs if improving the visual clarity on R means it's easier to dodge, just let me see the damn indicator.
10.13 buffs for reference.
- Q - CAUSTIC SPITTLE DAMAGE RATIO
0.5 ability power⇒ 0.7 ability power - R - LIVING ARTILLERY DAMAGE RATIO
0.25 ability power⇒ 0.35 ability power