I am still waiting for the computing world to catch up to the instant-boot, straight-to-REPL joy that was my Commodore 128. I say that only partly tongue-in-ch

I am still waiting for the computing world to catch up to the instant-boot, straight-to-REPL joy that was my Commodore 128. I say that only partly tongue-in-cheek. The home machines in that era were right on the cusp; they were complex enough that you could do Genuinely Interesting Stuff with them, and simple enough that you could still hold the whole machine in your head. The instant feedback of REPL being the primary interface, and the almost zero-time cost of rebooting when an experiment didn't work out, made for a spectacular tool for self-learning.