Remember reading that Satoshi Nakomoto, was attempted to be traced via when 'he/she' was awake, and online, and implying which time zone he/she was in. Can't remember what time zone was picked.

Loss of BTC or No Proof of Life for wallets - seems a flaw to me, and possibly a threat to the sustainability of any blockchain. Should wallets that have No Proof of Life or 'ping' at least once in a calendar year, be recycled by the miners?

1 million BTC untouched - being held by 'We' whoever these people are in the BTC White Paper (The English is very good in the White Paper). This might be another problem of mainstream adoption of BTC, resentment of the wealth and possible future centralised power of early adopters.

(Only started buying BTC at gold price parity, not a programmer, there is still a lot of work needed for a Crypto to go mainstream. Trust is not there for most people - I struggle to get aquaintances involved, despite BTC gain of x4 for most of my BTC...)