Other coins are even harder in just creating ALL supply in one instant. That makes them both harder and worse.

A constant emission would minimize concentration of wealth yet still have inflation rate going to zero.

You're also making the mistake of assuming equal demand: Bitcoin is inherently deflationary but it's also completely voluntary — few people use it and nobody is required to use it. Bitcoin's high variability over the years shows that speculator demand can last for years but there's no lock-in and many competing options. There are a few people who've put large amounts of money into it but statistically almost nobody uses it so there's little defense against a competitor because most people have no sunk cost and most of the percentage who do have only a small holding at risk.