Bitcoin is also money printed out of thin air. Bitcoin is also a fiat currency. It may be impossible to change the rate of Bitcoin printing, but it's definitely possible to print more cryptocurrencies (see Ethereum, Monero, Solana, Tron, etc), it's definitely the case that bitcoin's non-deflationary nature is terrible for it as a medium of exchange as it encourages hoarding and destabilises the value, and it's definitely the case that it's impossible for any currency with a fixed issuing rate to maintain a stable value.