agreed - grinding back, and exposing the rust - and not treating it at all is a piss weak effort, much can be said about such questionable workmanship
however,
another thought for rust (not removal, but maybe containing?) is when u have a small amount of rust from where the paint cracked when u rolled your guards - simply cover it with some clear nail polish - and it will contain it, until u are ready to remove it and fix it correctly (usually done when car is re-sprayed)
i am going to do this once it stops raining and it is dry
the job you've done in the pics looks quality mang!
ps, also ordered some epic headlights - hopefully ill actaully be able to see more than 10metres in front of me hahahha