Totally agree. I was thinking about throwing that exact thing on Discord last week. Seems asinine that H10 isn't at least equal to L20 for Tourney and DD points/energy
As long as there is training overlap with the dungeon tourneys for fusions, I exclusively run L20 with food. However, if there is a fusion tourney that pops with no training overlap, I will run H10 Dragon if Speed is boosted, H10 IG if Reflex is boosted and H10 FK if Savage is boosted. Other than those three sets, nothing gets me off L20 due to the points/energy efficiency.
Honestly I don't even do that. Im basically all 20 all the time. Too many other better sets.