Here's my take. I've always seal coated. Promised myself I wouldn't do it next time, and always end up doing again !
If your hull is void of flaws, staple holes, and basic imperfections. Seal coat is not needed. I helped a friend glass his first canoe. He did an outstanding job of stapleless construction. ! We wet out the cloth, without a seal coat, and it was great !
Resin type may play a role in deciding also. Thin resin I would seal coat.
I always worried about staple holes weeping away resin, and outgassing. 20 oz of resin to seal coat a normal solo. I also believe it took less resin to wet the cloth out. So near a toss up.
It's really the builders choice !
Jim