Exactly nobody cares who just dinged 50. But people might care when the last time the top farmed mobs were last killed (legion, dragon, and while not currently reported GK/Evern/GG). having random ding 50 spam knock this actually useful information off the herald is undesirable.

Suggestion: eliminate "reached leevl 50" spam from herald. or increase the length of herald pve information so that the useful stuff stays on there longer.