Comment by IshKebab

Yeah I think that's the only plausible reason. Quite patronising but I think it probably came from an honest "make programming more accessible to non-programmers" place. They just forgot that the rest of programming exists...

You see that in books and papers and tutorials a lot. They'll explain some basic concepts nicely and then realise that they can't really explain ELI5 calculus and skip straight into Laplace transforms.

I once read a highly technical manual for a SystemVerilog simulator that began by explaining what double-clicking was. No joke. That's basically 1-based indexing.