I actually like this idea and the on-screen dynamic between the two, but in episode 5 Fitz and HeadSimmons kind of teased something more... er, personal... This is why I say bromance, because there is a difference between a friendship and a bromance. Any guy knows that.
I would love the show to explore this angle some more, as 1) I think Mack is incredibly goodlooking and 2) Fitz is adorable, but the MCU has a bad record when it comes to LGBT characters & relationships. In the short All Hail The King and Guardians of the Galaxy (ugh) they did the prison b*tch thing, and the brilliant character of Victoria Hand (lesbian) was killed off. So, if they do this, they need to do it right.
Fitz should not be distracted by the return of Simmons anyway, because it seems that the show has gone back to the TrippSimmons (Simlett?) shipping. Anyway, is it too early to start shipping Fitzmac?
On a related note, should the show fix Fits or show him learning to deal with his handicap?