When playing the actual RPS-game, you have the choice of what you take. In cRPG you choose one of those and then you are stuck with it.
cRPG allows for customization of equipment loads and alternate characters. People are not stuck, at best they just want to grind that same 2h character and can't even be bothered to take a bamboo spear with them.
I hope you understand that it sucks if you choose rock and then notice that the majority of all players on the server are paper.
Of course it's much harder, but let's not kid ourselves about someone forcing you to play rock only.
One is their missing will to adapt
Duh. Plenty of that around.
or the missing thinking of "countering" something, rather than wanting to make kills themselves. (For example if on one round they get steamrolled by a cav heavy team, then next round they wouldn't go spearman, pikeman, thrower or archer to counter the horses, they would go cavalry themselves, because they saw cavalry made a lot of kills last round. That's the cRPG way of thinking.).
That's a way to adapt, except with the slight error that nobody wants to be the 2 or 4 cavs against the cav heavy team. I find it easier and more productive to grab a pike and protect the main infantry mass in that situation, rather than diving into a horde of enemy HA, lancers and 1h cav.
Another reason is that many people, me included, don't have many alts and play them even more seldom. I am happy whenever I can retire with my main, I don't have the time and patience to also equip alts with heirlooms. (Yes, part of my motivation is grind for better equipment. I guess that's nothing special...)
You don't need a heirloomed pike to bring down a horse, though.
But alts are free, you could create some the next time your team needs you.
And finally not everybody likes to play all classes and has corresponding alts.
Like I said, alts are free and the rest, when put into argument form, looks something like this:
Because people don't want to play scissors, paper should be nerfed. Am I wrong?