Think you've hit on it here Deadbat. Our midfielders don't have movement ahead of them so they do the sensible thing and keep possession by playing it square or backwards. Unfortunately, you had a chalk-and-cheese comparison up front with Mitrovic and Donaldson while the Fulham wingers were able to provide an outlet: as they had the edge on our wingbacks in terms of pace it stopped Baldock and Stevens getting forward as effectively.
One small criticism hinted at earlier was that Wilder waited until half time to change things around. We had the personnel to go to 4-3-3 (and match Fulham) even if it wouldn't have been perfect: a back four of Baldock - Stearman - O'Connell - Stevens with Evans - Basham - Fleck in midfield and Duffy - Donaldson - Sharp up front. That would have covered the width of Fulham's attacking better. Holmes for Donaldson at half time would have given us the option to drop into a 4-5-1 too.
Pushing Basham into midfield early in the game when the formation wasn't working was something we did on a regular basis last season. It was very effective. Maybe we are more cautious this season because of the quality and pace of the opposition.