do kids truly learn from Blockly? how long before they move on to a real programming language?

From the Raspberry Pi blog post on taking over Blockly:

> Platforms like Scratch, MakeCode, and MIT’s App Inventor are all built with Blockly. It’s no exaggeration to say that hundreds of millions of young people have learnt the fundamentals of computer science using software that is built with Blockly.

See also: https://www.raspberrypi.org/blog/new-home-for-blockly/