Also in my opinion these break out boards are not that useful (chocolate teapot).
If the intention is to use them with plug in breadboards then they will normally cover up all the connecting holes. So you end up using wires to connect the break out board to the breadboard. Messy and increasing wire lengths is never a good idea. One can work around that by sawing the breadboard in half so that they can be spaced out.
However, then you have the issue that the esp-12 module is committed to the soldered in break out. If you leave that one for development then you still have the issue of how to connect to program modules that you are going to deploy.
Using a dev board with built in usb / power supply is easy for development and can be used for final solution in some cases. If wanting to deploy esp-12 modules (smaller / cheaper) then you want some form of temporary connection jig. There are various schemes around for this. I now use a pogo pin based method which works for both development and programming, e.g.
https://www.thingiverse.com/thing:2844982