Knowing what Part 21 Type Certificate you have matters because that is how
the other Parts of CFR 14 are tied together. Say one doesn't know they have
an experimental type certificate, then how can they know that Part 23 and 43
are not applicable? Additional regulatory requirements are made for Normal
Catagory airplanes that may be an undue burden for someone building their
own airplane, that they are intending to operate themselves. Even if later
some of these are sold, it is my estimation that a homebuilt with 200 hours
on it is an order of magnitude safer than a green one.