The very mention of Intergang made me waaaaay happier than it should have

Only if they were to actually commit to it long term, and not just use it as yet another roadblock on the road to the inevitable actual romances.

Preach. I think in either Ollie and Felicity or Barry and Iris, it would have been a smarter move to get them together, and then just let it be. Have plots about other things, let them coast on their chemistry for awhile, not everything needs to be needlessly convoluted.