I have summarized your statement in many of my comments on here that @spirit454
spins and talks around
-There is no perfect system
-The RPI is not a ranking of top teams, but an order based on a formula
-The formula has limitations (quantifying good losses/playing oos teams/injuries/head-to-head) which cause some head-scratching "rankings"
-The formula is heavily skewed by winning percentage
All that causes me to say coaches voting is better, but acknowledging all of the above and saying you accept that and still prefer RPI is reasonable as well.