They don't bring much of pollen, when brood isn't above. Due to my operations when I lift up unsealed brood, they do bring up in that or neighbouring frame some pollen. But I see no problem in that.
As black locust is my main forage, itself has little pollen anyway. Before it I strip off all honey in supers or mark the frames which are stuffed with spring honey and extract at the end as spring honey ( slower crystalisation due black locust). This isn't drastic for the bees because I wait to main forage start, then first days of it I extract spring honey. So bees just continue with forage and if want I can extract right beside the hives and none of bees will pay attention toward the taken frames, they are seduced with black locust and only see its flowers. In that time you can do with poor bees whatever cross your mind.
Also some colonies are bringing pollen as mad and I intentionally lift up such pollen rich frames to make room below excuder for the queen ( fermented pollen or "perga" as we say) and use later for splits and young colonies for " unbelievable boost".
Fermented pollen is treasure for colonies, at least by my opinion.
When extracting, I have "manual" extractor since for 50 colonies it is sufficient and if want to extract such pollen rich frames I carefully extract and comb stay intact.