> That only pins the value of a bitcoin in relation to other bitcoins - it does nothing to pin the value of a bitcoin to real-world goods.

This is true, but it's also true for dollars. No goods are inherently pinned to a dollar value. Goods are priced in dollars with the expectation that the seller will earn a profit if sold at a given rate.

But if that dollar loses its purchasing power, mostly due to it being inflated by central banks, then the price of goods in dollars will have to increase for the seller to earn the same profit. It is not sufficient for the seller to just increase their goods at the rate of inflation either, because the cost of all their expenditures increases too. To earn the same profit after inflation, they need to increase their revenue more than the rate of inflation. This has a ripple effect over all industries.

On the other hand, if the non-inflationary currency is not losing its purchasing power over the same periods, then merchants will prefer to obtain the non-inflationary currency over the inflationary one. If they obtain both, they will use the inflationary currency first to purchase new materials, and only dig in to the non-inflationary currency as and when they run out of the inflationary currency.

If eventually, businesses decide to price their goods in bitcoin, rather than the dollar amount of bitcoin at the current market exchange rate, then they might be able to expect that they will not need to keep raising prices annually for inflation, but might instead be able to lower them, or keep them at the same rate and increase their profits for as long as a cheaper competitor does not appear. However, if these goods are priced both in bitcoin and USD, then while the bitcoin value remains the same, the dollar value must continue to increase for inflation.

Since bitcoin also enables a certain level of transactional privacy too, it will also be used for grey and black market transactions, which make up 10-20% of economies. Most people interact either directly or indirectly with these markets for saving money or generating additional profit. Cash has traditionally been used in these cases, but as the effort of states to make money digital, under mass warrantless surveillance increases, the practicality of using cash decreases. Bitcoin is well suited to fill the gap being created.

> As bad as inflation is, a deflating currency is not any better.

I often hear strawmen arguments against deflation, but never any real sources or evidence of how terrible it supposedly is. I'm led to believe that people won't spend money in a deflationary economy, but peoples need to eat and drink suggests otherwise.

An example of deflation in action is in Moore's Law. If I buy a computer now, it will be half as powerful in 1.5 years. Why would I not just wait 2 years and buy a computer then? People continue to buy new machines all the time, and they don't wait 2 years for the next iteration, because they know that in another 2 years, that one is out of date. People will spend for as long as they perceive the transaction is worthwhile now for the labour effort they put in to acquire that amount in currency. In a deflationary economy, people simply make better decisions, because they're not simply comparing the amount to what they earned recently, but in any significant transaction they need to weigh the importance of the transaction against their future self.

I think the real complaints about deflation are from socialist types who worry that the rich will get richer. Too bad for them, they can't prevent this any longer. The state no longer has the capacity to steal people's bitcoin if they take the right measures to secure their keys. The rich might get richer, but anyone can get better off if they shift to a low time-preference mindset, instead of being stuck in the debt spirals that are encouraged by high time-preference economies.

> Of course, the proposed solution to bitcoin deflation was (at least at one point) just to inflate the bitcoin currency by effectively moving the decimal point to the right (one bitcoin becomes 10, etc).

The "bitcoin" denomination is really just cosmetic anyway. All of the values in the bitcoin protocol are measured in satoshis, as a 64-bit integer. It is not trivial to change this denomination as it would affect the entire UTXO set of transactions. On the other hand, moving the decimal place for the cosmetic appearance of satoshis could be trivial, but it doesn't change much.