It would be great if level 50 heroes no longer drained experience.
Level 50 heroes at the moment will drain experience from the total experience available when completing a dungeon or siege/duel.
On older servers, players are now approaching 5-6 heroes at level 50.
It feels punishing to field max level heroes when they take experience away from other heroes.
A change like this would feel rewarding to the players who have put in the time and effort in getting their heroes to max level (it takes quite some work!)