Even the TRS-80 Model 100 had it's own market for software that was thriving for about three years - complete with requisite magazine support.
...
My hunch is that the new generation of people who recently discovered the recent application ecosystems are shocked to find out that some slightly-older people remember when this same exciting feeling happened before - I would imagine all the way back to the late 1970's when you could put a computer together yourself and sell software out of your garage.