In my country the inflation rate averaged between 1% to 3% per year over the last 5 years. So whatever investments I had to make, I had to beat inflation for me to say that I am moving forward.
I am one of the fortunate people who invested in Bitcoin, when the price was around $400 per coin. Since then I have been smashing inflation on my investments made into Bitcoin.
In 2017 I obliterated inflation and I sold some coins, which was re-invested into other investments that also beat inflation. I can with all honesty say, that I am not bothered with inflation, even if it goes up to 100% for the next few years.
Let's celebrate the fact that Bitcoin enabled us to beat inflation for the last couple of years. 
You make a good point about how investment returns should be calculated after inflation adjustment.
I see a lot of people looking at their savings accounts as some way to invest in the long run, while in reality, they are actually losing money from inflation overall. It's also important to note that the CPI index generated by governments may not be reflective of the actual inflation going on.
Bitcoin is a good hedge against fiat inflation given that it's completely independent from fiat and has a capped supply, which essentially means that in the long run, as long as adoption increases or stays the same, bitcoin should hold its value relatively stably. It's these properties that I think make bitcoin extremely useful for those in countries plagued by hyperinflation, as a safe haven to store wealth in.
You know, it is also not just the inflation that are killing most people. The government take their share of taxes from the profits from the different types of investments too, so you need to add the tax onto the inflation, to see what your real profits was. In a lot of instances, people are actually losing money, by investing it in safe investment options with low returns.
These types of investments, always reminds me of the little mouse, running inside a wheel , in his little cage. You are running, but you are not going anywhere.
Bitcoin returns beats inflation and taxes and breaks out of the little cage.
