When I was much younger, all I did was brush; I couldn't get the hang of airbrushing but then there was no internet to look up video tutorials.
Once I returned to modeling less than a decade ago, I became determined to learn to use one and now that is mostly how I paint everything. About the only thing I use brushes for now are instrument panels, some small details, and weathering.
Everything here is AB except the IP
All AB except the tool handles and sighting poles. The silver on the gun carriage is colored pencil.