What's with the complaints about Fighter Road XP as a reward?

I keep seeing this about the rogue rift and I truly don't get it. One of the biggest criticisms against this game is how hard it is to unlock characters in the Fighter Road, but any time that FR XP is an event reward there are constant complaints about how worthless it is. Shouldn't we be happy about that new player experience being a bit smoother, rather than complaining that us as people who have grinded out the entire roster are just getting battlepass xp?