Scratch is a big deal
I like Scratch - my kid uses it and I worked briefly with the guy who made Blockly, the underlying visual programming toolkit - but the programming environment makes many things far too complicated with its singular focus on sprites.It's very, very difficult to do things as simple as display a number on screen. My 7yo was making a number guessing game, and to display a two-digit number we had to make two sprites that had 10 "costumes" (0-9) then do modular math to select the costume for each digit. Sprites also have their own code, and if you duplicate one and edit the code the edits don't apply to the duplicate - so there's no user library or abstraction power at all.This made dealing with Scratch far more complex and time-consuming than the logic of the game my kid was making, which is the exact opposite of what you want in a learning environment. I don't really want to focus on the idiosyncrasies of Scratch when teaching programming.Some simple text and drawing commands, user-defined functions, and a library would go a huge way towards making Scratch simpler. There are some other Blockly-based environments that may have this... but they're not as popular.