Why is Taliyah's damage so gated and unreliable?

I always feel like Tali was designed to be difficult to play with no real compensation. I'm a Syndra main and my Q>E combo does more damage and is more reliable than everything in Tali's kit. I don't get why she is so fundamentally gated in her combos that even go so far as to work against it's self when trading in lane. There is no other champ in the game that can fuck themselves over by using an ability 100 seconds before they needed it. Worked ground is a dumb concept. It just is. That combined with the mediocre damage on her w alongside its the terrible delay on all her moves and damage she feels clunky for the sake of clunky. Everything is gated so you can do well vs. any champ with easy accessible damage like, ya know every mid and top laner!