What the title means is simply putting, her Q shouldn't heal AND do damage and her R shouldn't deal high damage AND shield.
I get she's a support, but the fact she has so much strength in her kits with no real draw backs on the spells is annoying. She seriously needs a looked at as standing in lane with her spamming heals and constant damage is obnoxious, while her one root feels like the range is inconsistent and is either short or excessively long.
Nami Q heals and damages. Rakan Q heals and damages. Soraka Q heals and damages. Ivern E shields and damages. Oriana E shields and damages. Janna R heals and stuns.
It's not unheard of for a support champion's abilities to affect both allies and enemies.
You've obviously never played Senna, or you would know that her abilities have huge drawbacks. Her Q cannot be spammed, the mana cost is stupid high and her mana pool is low. If she casts it on cooldown, she'll run out of mana lightning fast while also needing to push the wave to get the cooldown back. She has mana problems, despite having long cooldowns. Everything in her kit is on a long delay, including her autoattacks, and all of her spells can be avoided.
She shouldnt be able to heal herself.
