In isolation, sure writing code more expressively isn't a bad thing, and might be fine as an exercise for becoming more familiar with some part of the codebase, but I don't think it's a good use of time for the author or reviewers to go and do this without some other motivation or if you're touching the code already.

Getting someone new is itself motivation. And if the result is better code thateis a good use of time.

often manual loops have unnoticed off by one errors as well so the above exercise can fix weird bugs nobody has figured out.