We already know that bitcoin is limited.
The whole point of lending sats is broken in Bitcoinlandia because in the end one part will be in debt or totally rekt, but not forever.
Bitcoin brings a total change: it's a savings machine. For more you save, more purchasing power you will have for your saved sats.
So if I want to buy more stuff, I will just save and I will spend ONLY when is really needed.
Your system is broken because is based on a fiat mindset, on pure endless consumption, putting the user in forever debt.
There are some use cases. For example, if you want to do some non-KYC small leverage few month long position on a BTC vs fiat, you can borrow stablecoins against BTC loan and then use them to purchase more BTC. Or you could borrow fiat for daily expenses against BTC loan instead of selling BTC, with hope that BTC will go up, and you will be able to give back loan cheaper. Most important is to look at non-KYC non-custodial platforms (2-of-3 or 3-of-4 multisig is ok, giving up custody of your sats isn't). Good platforms for these cases are lend.hodlhodl.com and debifi.com. There are some others, I just don't recall the names from my head right now.