I set up a raspberry pi to auto boot into Commodore 64 mode with a BASIC command line. It was a fantastic start, there is something magical about that experience. The boy then shifted to scratch and also uses REPLIT.
Like an msdos without the unrelevant parts (system files, configuration,..) with a good enough/interesting set of apps tailored for 5-10yo children
In my mind the idea makes sense at least :_D