Morning Guy,
I've seen people go both ways and it is more a preference than anything else. The advantage of the helix cutterhead is as you said having 4 cutting surfaces so if you damage a cutter you simply loosen, turn, and tighten. Once you've used the 4 sides it's time to replace. The down side is the expense and work involved if you're replacing the cutterhead in an existing planer. I'm not aware of the Dewalt planer being available with the helix cutter but maybe it is these days. From what I've seen of the videos posted of installing one it seems straight forward but I've not done one myself. On the other hand if carbide steel planer blades are available for the Dewalt it is easier to replace the blades than a whole cutterhead replacement and costs less. Those blades as you know can be sharpened many times as can be the HHS. The resulting cut was never intended to be the "finished" surface just as the surface from the 16-32 isn't usually either. Usually a random orbital sander with finer grits are used but not always. Regardless, sanding is usually the last process before finishing.
I've seen people go both ways and it is more a preference than anything else. The advantage of the helix cutterhead is as you said having 4 cutting surfaces so if you damage a cutter you simply loosen, turn, and tighten. Once you've used the 4 sides it's time to replace. The down side is the expense and work involved if you're replacing the cutterhead in an existing planer. I'm not aware of the Dewalt planer being available with the helix cutter but maybe it is these days. From what I've seen of the videos posted of installing one it seems straight forward but I've not done one myself. On the other hand if carbide steel planer blades are available for the Dewalt it is easier to replace the blades than a whole cutterhead replacement and costs less. Those blades as you know can be sharpened many times as can be the HHS. The resulting cut was never intended to be the "finished" surface just as the surface from the 16-32 isn't usually either. Usually a random orbital sander with finer grits are used but not always. Regardless, sanding is usually the last process before finishing.