I'm not sure what you mean by portable fashion. I used a Pancake compressor for finish nailing on a job site back in the day. Last time I used them I powered them from my 60 gallon compressor running 100' of hose from the garage down the basement steps. All three tools got a workout doing framing and finish work.
I have three nail guns, a framing nailer, a finish nailer, and a brad/stapler. I use about 5 drops of oil in the framer, 3 in the other two guns. I will get a little hint of oil the first few shots, that's about it. I'd rather over oil the tool than under oil it, 3-5 drops seems to be the magic numbers.
What I meant about portable is what you describe. A pancake small compressor, on a job site, isn’t necessarily set up to have all kinds of filters and driers. Thus the quality of air to those nailing tools isn’t the best, as compared to someone who has a big permanently installed compressor with a piping system and all kinds of filters and driers and whatnot.
Unless there’s some kind of inline filter I should be using on the job site. I used to use inline desiccant filters but they get wet naturally over time, and they can shed fines which aren’t good for the tools.
So nailing tools may not get as great of air supply. That’s all.