What if having more than one royal steed (aka arena horse)?

[Kitwritten]

its hard to say, different players have different thinking about the legendary sets... so I can not really answer it

[WNewman]

OK, thanks, Kitwritten.

So once we get the arena horse, there's really no much interest in getting more insignia than buying arena set (and of course some misc small purchases like endurance potion), right?

Those armor, weapon, etc shards are pretty useless, IMO. I have never seen any lvl 50 or 60 player in my server is using legendary blacksmith set.

[Kitwritten]

no, but different types of mounts will result in the stats stacking up like you want