Comment by Mallory_Ringess

They didn't. There was a bit of an interval between the days of diversity - the Commodores, Sinclairs, Ataris, the CP/M machines, everything from build-your-own to sleek futuristic designs, etc - and the free software revolution which saw Linux and the BSDs cement themselves as the future in some or other form. Now? Software is free and open, hardware is cheap and plentiful, hardware hacking is back, if you want to create something which has not been created before there's a fair chance of success. If you succeed you can easily publish your designs, others get to pick them up and improve upon them and publish their improvements. Computers are more capable than ever, just stay away from the walled gardens and the shiny traps created by the likes of Microsoft and Apple and Google and you're free to do what you want.