simply put, it has to make sense. for mining, only the few collect, and many times the minted coin rate is predefined per block and blocks have a slow rate per day. Since only those with equipment mine, this limits those who actually get new coins

for POS, everyone can stake. In order to prevent hyper inflation (too many coins minted per day), you HAVE to have a low stake rate. Anything high will instantly lend to hyperinflation and making the coin worthless over time.

The better the rate, the more people stake. Since staking is like interest, you start to have compound interest and the minted coins per day rate gets insane.