Wikipedia lists Deflation as a bad thing, but I'm assuming that the article makes the assumption that the currency is a fiat currency (as opposed to cryptocurrency). I understand the general principle of deflation being a bad thing, especially if the government in question is actually printing more money as governments are want to do...
The Wikipedia article does make a good point about debt, as most newly printed money (as I understand it) is loaned out for interest to local business etc to allow for proper growth of the economy, and during deflation, debt increases in value, which is the opposite of what is usually happening in modern society.
But my question is regarding cryptocurrencies that are not issued or controlled by governments. Do the same factors (or others) mean that once, for example, all bitcoins have been 'mined' that the supply will be fixed and deflation will begin... how would that be a bad thing?
This question is not a duplicate of "Is any aspect of the cryptocurrency adoption violating a widely held economic tenet?" because this is a focused question asking about a specific part of how cryptocurrencies work and whether or not "deflation" is still bad given the context in which cryptocurrencies are created and used.
Are upper limits to the amount of circulating 'units' bad, and should cryptocurrencies change their monetary policies to avoid the pitfalls of defaltion?