From the day of bitcoin into usage there is periodic growth with time. At some point there is unexpected price increase which boosted the expectation among the cryptocurrency users. This doesn't mean that bitcoin needs to reach ath quite often.
People do forget where bitcoin is trading right now but keep demanding it to be performing like "top currency of the year" all the times. (I remember bitcoin was marked as worst currency of the year in 2014 but in 2017 topped as best currency of the year). It is always investors expectations to have 10x growth of all the assets where they have invested. They do fail to realize the basic price action which ends up usually spreading FUDs.
As most people my preference of bitcoin and other cryptocurrency were a form of investment. Till date it has provided with a profit out of the growth and same continues as the demand keeps growing.
When people agreed cryptocurrencies as good investments then it implicitly denotes they are growing over the time or at least it is having good volatility to make use for both traders and investors (by volatility we can assume it is having both rising and falling trends as no asset can be into falling trend when we market as a good investment opportunity).