Bitcoin isn't static or deflationary. There is a schedule of inflation built in via the mining reward which is currently at 1.5% until the next "halvening" where it will become 0.75%. The mining reward will continue to half every 4 years until roughly near the year 2140.

https://charts.woobull.com/bitcoin-inflation/

' deflationary currency ... leads to hoarding of assets '.

Someone owns every asset. By making it impractical to save using the fiat money, savings goes to non-fiat items like land, stocks, energy, and BTC. This harms the poor who are rarely able to escape into those non-money items.