It's a fucking scam, that's what the problem is. The default stuff you get in the game is purposely much worse, inadequate or insufficient to what should be normal, in order to encourage players to actually spend money for stuff that should have already been in the game. Or it is indeed available in the game but acquiring it requires monumental grinding, also to encourage players to spend money for it.
It's how f2ps/b2p with cash shops work.