might I just say that tira is one of the bottom line worst characters in the game, hanging with rock talim and mina.
So yes. She's crippled. The reasons you are throwing combos out so easily is because no one online knows how to play tira. Never mind against her. Its all ignorance.
Tira does however have some amazing combos. I love her for that, im so attracted to flashy combos its insane, But they are usually started by something unsafe, or slow. Her frames are nothing to brag about, her damage is alright to me, I think based upon the sheer amount of hits she gets in a combo balances out her low single strike output. Tira has some decent step catchers though and is definitely alright in that regard. But the moves she can throw out for damage leave little for mixup opportunity and that is what restrains her from tossing out her 4B

B 88A 4A:A 44444K 66666B every five minutes.
She needs more low mid strings in my opinion, i.e 4B

B gets a 4B

B which would cause a 50/50 guess scenerio, the 4B

B being something along the lines of 4B Gs 1A 66666B without the need for inputs. Resulting in heavy damage either way. That and the possibility of a cancel.
The biggest issue I have with tira though is her frames. That and her move list, keep in mind that if Tira gets bumped up even just to mid tier, and starts to become an issue for other players she WILL be checked out, which will be a problem for her movelist because of how slow her combo starters are, and how linear some of them are as well.
She needs an incredible amount of adjusting, while she is incredibly fun, and her base design is there and interesting, she has many more issues as opposed to thinking throwing in a guaranteed switch will save her.