Why do Glyph uses draw their characters like this?

I apologize to the Glyphs and Typography community for my rather ignorant question. I am still learning not only the interface of Glyphs itself but type design in general.

I often see characters drawn either in tutorials or in screenshots of the Glyphs UI when fellow users share their work in progress. I can’t help but feel like I am missing some sort of fundamental lesson as to why I see characters being drawn this way. With their paths sort of perfectly criss-crossing one another and remaining a single path rather than multiple pieces or paths.

Would anyone be able to explain why this is?

Thank you again. I love Glyphs and am excited to keep learning more.

This is done so you can adjust the stroke width easier without resetting the stroke parallel or join point over and over

Ah yes that makes sense! Thank you!