Becasue there is no real counter to that combo, which is annoying. (All except bringing more players)
Even at narrow spaces, where a mount cant maneuver, the spammed attacks can be soaked by the mount itself instead of letting the opponent take the player down. Players wish for using tactics and counter combos. But it doesnt exist yet.
Pvpers being not fair… Pvpers are not evil people at all. The opposite they re straightforward and you know what they have at mind. They just play a player to player combat game; instead of building forever and killing poorweak Npcs forever. You can join a clan there and have fun times.
At many games I played, I have seen alot more toxic ‘gamers’ who pretend to be PvErs (but actual trolls) who grief in game or at the game forums. They simply try to bash/flag other peoples suggestions or ideas only because they dont enjoy the idea.
As a note I am a free roaming player who plays pve, pvp and roleplay at games.