Yup, very good summary. I'll add: advantage of this design, is that you only need a SODIMM connector on your breakout board, which is very easy to source. Also,

Yup, very good summary. I'll add: advantage of this design, is that you only need a SODIMM connector on your breakout board, which is very easy to source. Also, you can have a breakout board tailored to your needs, relatively cheap (e.g less PCB layers), with less care for radio design (most of it is done on the module), etc. It's mostly advantageous for low-quantity, high margin embedded systems, with modules supported for years.