The thing about it is if you ran 2 fades and a seam the safety to the seam's side would read that and play him.
You don't seem to understand that the tampa 2 is NOT made to stop short stuff. Its is made to stop everything deep and force the O to pass under pressure by a speedy front 4, they must be able to slowly work their way downfield and the D is hoping the pressure can create a mistake due to only the short passes being available making scoring drives very long. Longer drives give more oppertunities for mistakes, hence why the bears D is a consistent top 5 turnover team.
They are also rank very well in YPPA (yards per pass attempt). They were the #1 lowest in the NFL in 05 and 06 and top 10 in every year except 07 since Smith became coach. With teams like the Bills, Bucs, Panthers, and Colts consistently making top 10 and top 5 apperances during their years using the cover 2 since it was introduced with a few #1 appearances as well. Showing that the cover 2 stops anything deep.
Believe me, if it was so easy as throwing a pass down the seam the cover 2 would have never seen multiple superbowl showings. If the proper players are in place the cover 2 can't be beat. There are no holes that can be exploited for enough yards to make a defference. The only thing it gives up is the short hitch between the LB and CB (not enough yards if the D does its job), the quick slant (again if the OLB gets there its shorter than the average run and he should always get there), and the deep out or corner with a decoy in the flat (if the Dline does its job the QB won't have the time and thats if the safety is not able to get over in time, which is rareky the case).
I'm not saying the D should hold up like a cover 4 all the way down field, but in a real Tampa 2 the CBs will pass the WRs off to the safety around 12 yards down field. If they could have them do that it would not only be realistic but also not the "perfect D" you think I want. I want it to be what it is, if its in the game its in the game you know? If you use a 3-4 you get the benifit of confusing the O with who is rushing just like real 3-4 defenses do. If you use a nickel D you get the ability to have more speed, just like in real life. So why not be able to hold a team to small gains and force turnovers while holding deep passes to a minimum with a tampa 2 like in real life? If you don't have the right pass rush it won't work, same with a MLB that isn't great in coverage, or good cover safeties, or CBs that can't press well enough to give the safeties time to get over the top.
If you have the players you should be able to run the scheme. If the O has the right scheme they can beat it just as real teams do. On top of that it would be weak against the run so it won't be an every down D, but if a team is in 3rd and 10 a cover 2 should be able to do what it does in RL, not get beat by a streak down the sideline while the CB sits in the flat instead of taking him 10-12 yards then releasing him to the safety. Thats the way it works in the real world so why can't it in the game?