To that end, I say it's a matter of reality checking in. No MMORPG has ever made general purpose goods (like minions or mounts) exclusively available in a specific format. In other words, the goods have never been only available in a means available to everyone, with or without some form of compensation. Collectors and achievement hunters are a burden upon themselves, especially with MMORPGs (source: me from over a decade ago).
"Pets/minions have never been exclusive or limited!" says the pet/minion collector, overlooking the fact that many pets or minions they have are exactly that. The idea that future collectors are instantaneously screwed out of their 100% collection attempts does not once cross their mind because the very idea would make them hypocrites to their own argument.
The methodology that one obtains the limited goods is not a valuable complaint when the primary argument is against the limited time of it, rather than the means of it. Again, an argument that can be shown as entitlement and hypocrisy. Especially when the collector mentality is not exclusive to minions in this game or any other. It can be literally anything. At that point, where does one draw the line of who wins, and who loses for their collecting efforts?
Alternative versions are generally fun, including runner up rewards. Breed competition among players. It's healthy. I guarantee though, given that damn PvP topic, the fact that it'd be an "either or" and not "both" would bring about an equal number of complaints.
I get that today's society is also vehemently rampant with anxiety issues, but that should never be a significant limiting factor on design goals. I have my own issues with anxiety, but I prefer to see games made without overly worrying about care bear and entitled players, even if it may not be something I'm willing to participate in. There's something enlightening about devs not caving in to the incessant complaining that takes place daily.