There are plenty of pins out there with perfect stripes, it just takes selective/reduced pattern breeding. You can google pins and find a bunch with perfect stripes. My pin from Pro Exotics only has one little break, and I paid a normal pin price for her.
And people aren't trying to be mean, we're just trying to say the whole reason we know pinstripes are dominant is because they have been breed over and over to prove they were dominant not codominant. Theoretically you could make a pin that makes only pins, but the chances are slim. We're just saying people have tried before.
If it really was that easy to make a homo pin or a super pin why aren't they on the market? Why can't we buy super/homo pins, spiders, etc. If you were going to buy something dominant, why not buy the super form of it if we could? Why not make it? Super forms are awesome snakes to have in your collection because it guarantees the babies being at least one morph. I just don't see it, in last 10-12 years that dominant morphs have come up we haven't been able to prove a reliable super form.