Is there actually anything *special* about BTC, as a technology, or was it just first?

LIke, if 21 million supply was a key feature - is there any reason someone couldn't just make an identical, less-functional, but with specific utility improvements, with say 20 or 50 million supply and have that, also, become a critical store of value? If this is not possible then the arbitrariness of BTC is confirmed; if it is possible then the uniqueness of BTC is destroyed.

I mean yes, we all know that it's essentially nothing more than a consensus. But it seems with all the institution and treasury buy-ups that BTC will soon start to waiver on its original purpose, that of decentralisation and freedom from banking system control.

Is there not the possibility to create a currency linked to, say, a biometric indicator, or rather, a wallet linked to a biometric indicator, such that no one individual may amass more than X-amount of the currency? Thus ensuring that is remains entirely decentralised, un-hoardable, and also encouraging trading and commerce?

Maybe a Layer-1 store of value and a layer-2 token with per-human limitations on the same chain? If that makes any difference..