Lot of those tractors ran for a lot of years and millions of hours without any filtration at all.
So I would say it's not crucial.
Yours wont hurt anything for sure but Zane is correct. And it is more exposed stuff to get hit and more places to leak or lose prime.
Ford didn't filter the hyd oil untill 1976. On the 26/3600 tractors they went to a gear pump which had the filter right on it.