I so, so wish something like Fuze was available for ioS. I'm an old-school ZX-Spectrum tinkerer and I still miss Basic. I can't help thinking it would still be unsurpassed as a simple (text-based) way of teaching coding to kids.
I learned on QBasic and have been out of the game for a long time but how do the kids start out these days? Do they use Python or JS? BASIC seems like the perfect language for complete beginners to start out on due to the lack of things like imports or main methods needed initially.
Scratch is frequently used to teach kids, but my (middle-school-aged) students found actual code in Python and JavaScript to be easier. There was a couple hours of frustration around some syntax things (python especially if you can believe it!) but once they had a good mental model they were much much faster with text than with visuals.
Perhaps Scratch is good for the first couple days of learning, but I think the ceiling hits pretty fast especially if the kids are really understanding the principles.