To be clear what we're agreeing to disagree about -- are you disagreeing on terminology, saying her slow field / poke is disengage?
Or are you disagreeing on how easy they are?
I feel her slow field and knock away are strong disengage tools. And her wall, but that cooldown is so long.
Her E can cover almost the entire lane, and her W, while, yes, a little difficult to land, can absolutely ruin any gank.
But I'm not gonna bring it up anymore. It's just not worth arguing about and I'm not a support main so it's not my area of expertise. I'm finding some success with it. But like I said, she's not, at the moment, a top tier support. I'm just saying she CAN be viable and if you want an off-meta, but still useful, pick, try her.