Yes, you can copy nonlegendary tokens by using copy abilities. You can copy legendary permanents too, you just probably don't want to.
Quote from Helm"s rulings page »
4/27/2018 The token isn’t legendary, and this exception is copiable. If something else copies the token later, that copy also won’t be legendary. If you control two or more permanents with the same name but only one is legendary, the “legend rule” doesn’t apply.
I like what they were going for with Teferi, even though I don't think the artist managed it exactly. Cultivate looks really good, and I like the stylised Kaya.
a) Printing special tokens costs more money than standard ones, and the CEOs want to maximise profit.
b) Magic is already a complex game, and they've already had issues with overloading the boardstate to the degree that casual players quit the game for a while.
Wee Dragonauts has been one of my favorite cards since I started playing with a pile of my friend's random Ravnica block cards. It's far from the most powerful creature, but the way it can be used as defensive tech with counterspells or as a giant swingy attack with a handful of Lightning Bolts makes it my favorite Izzet-colour creature for casual modern, and therefore my favorite card.
Alternatively, use a Bant defensive enchantments package like Privileged Position, Sphere of Safety,Ghostly Prison, Greater Auramancy, Propaganda, and things of that nature.
b) Magic is already a complex game, and they've already had issues with overloading the boardstate to the degree that casual players quit the game for a while.