Bitcoin is fairly "predictable". It's long term trend is upwards and its buying power increases in terms of tangible assets. I can't say the same for fiat currencies

Even KZT or RUB are more predictable, with less volatility. Try running a business, that is solely dependent on bitcoin. The prices, the wages, utility costs all planned based on value of bitcoin and see how far you can go. There is a reason why almost all the merchants need bitpay - because they offer the buffer of USD value stability that will make doing business possible. In my mind, bitcoin isn't actually a real currency because it lacks a mechanism for any value stability. It's just a technological gimmick that brought forward an idea how things could be in the future, when cryptocurrencies will actually become practical tools of finance.
You hope that bitcoin will trend upwards in the future. And sorry, but the hopes of bitcoiners aren't exactly solid enough to make a good store of value asset.
Oh look here we have the BTC doomer who thinks he's so well educated and brilliant and everyone else is just dumb to believe BTC could ever succeed. Well sorry bud but you were completely wrong about BTC earlier and even more wrong about LTC or PPC when you thought it would pump when BTC would pump before halving. Sorry, but your opinion doesn't hold much value considering your past failed predictions. As a global currency Bitcoin right now is not mature or good enough, but to boldly state that some other cryptocurrency will get there before Bitcoin does is quite a statement. A real currency doesn't need some outside mechanism for value stability, it needs liquidity and enough people trusting and using it as such. Gold and silver have done fine as a store of value for ages without such a mechanism as well. Paper currencies however have failed again and again to hold their value over time. So you're seeing this all upside down. Your hopes of some mystical superior cryptocurrency coming up are more delusional and cultish than the hopes of bitcoiners you like to criticize so much. We'll see who the future will proof right, hope you will still be here in a few years from now to admit you were wrong or right. I know I will.