Pretty much. If they had done it with some minor character it would probably have been fine but Ayra is easily one of the most popular if not the most popular from Genealogy of the Holy War and they made her kinda broken in Heroes so through skill and fame she was very desirable and when you pull the other guy who had already been released and your chances go down (every 5 summons your chance to get a 5 star hero increases but once you get one it goes back down to the base chance and she is only available as a 5 star) it can be very infuriating. So between all that and probably a little bit of leftover salt from the FE Warriors "pretty much ready to go" character DLC announcement all came together to produce all the salt.