I have a 5k screen and the biggest advantage for me when editing is that I can look at the photos at 1:1 and still see the whole photo (almost). So it makes it a lot easier. So a 4K screen on a laptop will help you with this too.
But as you said yourself. The best option is to have an external screen where you do the most edits and then have a portable yet powerful enough laptop for on the road edits.
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