Sona. Where is my competitive power boost

Been playing Sona for years now, and have to say she just feels like she's getting weaker and weaker as the game goes on. Started off with her massive power nerf with the rework, got worse with the tank shift in the bot lane, and has just kept sliding further and further into unplayable. Her damage in the early to mid game is a joke, even with powercord your aren't applying enough pressure to really drive opponents out of lane. Your cooldowns are so high you can't finish off opponents even if they are below 5% health. But worst of all, her utility is a joke. Your heal gives so little in regards to healing, i'd rather heal 1 target for the combined amount then heal myself and an ally for piss poor numbers. This doesn't even touch on how short the length of the shield is, or the INSANELY high base mana cost of her heal. I'm just so tired of a champion i love been a jack of all trade but not actually good at anyone of them.

Your damage is only a threat if you build like an AP mage, which you kind of have to if you want to have decent numbers on your utility. She lacks a gap closer so chasing/escaping is near impossible if your opponents are even removely decent. Add to this that she has some of the lowest base movement speed in the game, coupled with some of the lowest base health in game.

Can we also talk about how under whelming her powercord W and E feel? The damage reduction is hard to notice, and even if you do 20% damage reduction just doesn't feel very rewarding in the middle of a team fight. And her E.... that movement speed debuff is painfully little. most other champions rock a 50%+ movement speed debuff on their basic spells, so why does Sona, who can only get her's if E was the last spell cast and she has powercord up, get a 40% slow?