If you’re wondering, Why recorders? — there are three reasons:
They’re portable.
Recorders in decent enough quality can be cheaply produced, so even low-income children get to play one. Compare that with a guitar where 30$ gets you a piece of wood that detunes as soon as you lay eyes on it. Not great for practicing.
Recorders have an easily memorizable fingering scheme that allows you to quickly pick up the C Major scale. Compare this with a guitar where you need to remember for each string individually which frets have the notes of the scale.
If you’re wondering, Why recorders? — there are three reasons: