Grin team fucked up the economics, same mistake as Monero.
Monero supply schedule is really good almost perfect. Somehow is misunderstood by some. Right now Monero stock to flow is 26 while Bitcoins is 27.2, while Gold is around 60. This looks quite similar to me. But in next 10 years Monero stock to flow ratio will increase faster then Bitcoins. And in a year it will be way higher then of the Gold one forever. But it will never get to high to make us worry.