Winged tieflings and aarakocra hard to deal with even in P&P. In CRPG it would be outright game broken.
I think you failed to note where I said I did not expect actual flight to be a thing they get.
Also, it's not that hard in tabletop. You start to see lots of ways to get flight as players hit 5th level and the tools the GM has to deal with flight at that level are the same as the tools they have to deal with flight at any other level: the entirety of the world. It provides another layer of complexity, and it's traditionally been flavor-locked to later because the earliest campaigns wanted magic and such to be narratively more rare than it is in Faerun, closer to historical medieval periods. But it's not particularly hard to deal with.
I had two flyers in my Princes game....I played a flyer in Strahd....we had a couple of flyers in a Pathfinder game....we have several fliers (mostly items, but there was a pixie at one point) in my brother's game...none of them broke the game.
