OK, I'm going to say it ...
OF is less fun than IF (to most)
OF is less important than IF (always)
OF is easier to master than IF (to most)
OF is a better place to hide a weaker fielder than IF (most of the time)
The idea that infielders cost you bases and outfielders cost you runs is a spin job.
That doesn't mean OF is not important, or that it's easy, or that anybody can do it. All defensive positions are important, and all can win or lose the game.
But having a solid infield is a bigger priority on every team.
I mean, have you ever known a team looking for a great-fielding corner outfielder?
Which would you prefer then, 2 errors in a game by your 2B or 2 errors in a game by your RF? I think that's an easy answer. One cost you a bag the other coast multiple bags. Not to mention balls that should be clean singles down the line or into the gap become doubles by not playing good angles. If you play a bad angle on a ball in the 5-6 hole it's still a single. Also a diving stop by the SS prevents a single but a diving stop in the OF prevents a double or more.
If a team is playing at a high level they had better have solid defensive players everywhere.