@thurlow885 It is not a visual issue, it's a gameplay issue. It's not about the 5 subs, it's the ability to chose how to use them.
Sometimes when a game is decided you might want to bring on some youngsters with little gametime. In a tight cup game you're barely leading late you might want to throw on more defenders.
Problem is with only the bench of 7 your choices are extremely limited, and you basically have to determine your substitution pre game regardless of match development.
Also 9-15 players benches shouldn't result in more forfeits. There is a difference between the minimum players required on a bench, and the maximum allowed. Having like 12 in a league that allows those numbers, isn't mandatory.
The one problem I may suspect is it would force someone in this multi bullion dollar company to actually spend an afternoon to look up league rules, and code the possibility of empty slots. While they would much rather spend all their time making useless fut items someone might spend an extra buck on..