Stripping Paint From Cab - Need Surface Rust Tips

[ItWillBeSlow]

I have finished the rockers/cab corners/floor pans phase of my truck and am starting to prep the rest of the cab to get moving towards paint. My plan is to go bare metal and start with epoxy and go from there.

My truck has original paint + 1 respray + 1 coat of primer from 25 years ago, and I am beginning to sand through some areas to address dents, surface rust, and whatever else I don't know about yet. I am starting on the cab and am finding there is likely a fair amount of surface rust under my paint.

I have some major surface rust/pitting, that would require me to remove a fair amount of metal to get out completely. I have some "mild" surface rust that I can get shiny using red roloc surface prep pad with some effort. And I have some "very minor" surface rust that is fairly easy to remove with the roloc pad and low effort, about everywhere I have cut through.

Attached are a couple pictures for example.

Questions:
- Should I expect this "minor / mild rust" underneath all of my paint?
- What should I do about the "major" areas that require a heavy flap disc (or more) to get out? Is there another technique out there?
- While I can get a lot of this off, I am concerned my roloc discs will cut too many grooves/low spots in the metal that will all require filling. Am I overthinking this?

Open to all feedback and experiences here. I am doing this in a residential garage, and cant get it outside for blasting.