I'm with muzicman0. I rarely watch live TV, recording stuff to watch later most of the time.
Changing the OK button function would remove an annoyance for you... and add an annoyance for 10,478 other people. You want me to find the Info button to get to the menu? The smallest button on my Harmony? Which I've already mapped to something else?
All software has a learning curve and requires a time to make actions natural. The current situation is logical. Ok for the menu, Play to play the program. Makes sense to me!