I agree with you on this one. The rule change was supposedly put in to increase playing time. It will increase playing time for the #1 and maybe #2 substitute, but farther down the bench, it will reduce playing time.
It also simplifies life for the coach and complicates life for the umpire and scorekeeper.
I can't write too small, or I'd need to take my cheaters to the field - and that would hardly inspire confidence!