jgsugden
Legend
I suggest listening to some podcasts of higher level 5E play, such as the tail end of the Critical Role first campaign.Just because there are technically rules for higher than 10th level play doesn't mean the system does a good job at supporting that tier of play. The published content for levels 10+ is sorely lacking - whether advice for how to run games or published adventures. WotC has just sort of swept it under the rug, as if there is no assumption that anyone actually plays those levels.
My experience has been that the game completely breaks down around 10th level. (Actually probably closer to 5th level.)
While there has prviously been a slightly lss than idea number of released creatures for higher level play, there has been enough. Everything else works. I've had great high level games, I've listened to great high level games.... often, the problem with high level games is not the rules, but is people burning out on the game. That can be addressed through evolution of the game to give characters a feel that the game is constantly moving forward.
Seriously - there are a lot of great success stories out there that are irrefutable proof the game can work great at high levels.