no non no,a thousand times no,hornpipes should be written dotted.
jigs are not played exactly as written either.
hornpipes written dotted is closer to how they are played ,than to write them undotted.writing them dotted is the closest portrayal of how they are played,and lets face it there is regional variation in the dottedness.
the purpose of musiscal notation,is to be as accurate as possible ,writing them undotted is not closer than writing them dotted 3 to 1,is closer to 2 to 1[by 2],than writing 0 to 1 or undotted.