Since I'm a die-hard TimSteph shipper, I don't mind Tam not being a love interest for Tim. I'm mostly really glad Tynion fixed that horrible storyline in Batwing where she was in a coma. And is being awesome with Luke.
I think Steph was still really adjusting to being Batgirl, being a solo hero with serious support from the community and Batman's family, instead of being an outsider and a sidekick. She didn't want to fall back into being a sidekick or "just a love interest", and I think both of them needed to grow a bit before they could be in a healthy relationship. But I was glad of the almost-kiss, because it acknowledged that history and (I think) honored it without being bound by it.
Did Tam tease Tim about his engagement in Yost's run or FabNic's? I thought that was all Yost.
FabNic wrote Robin 175-183, the last arc. It had some good moments and nice art, but I think it's terribly incoherent when you try to read it as a larger narrative. Plus, despite fans loving Tim taking down Shiva, I still hold that up as a shining example of how even when you're not writing hacker-fu Tim, you still need to be a good plotter.