The thing is, the definition of "scratchbuilding" isn't a matter of opinion, it's a word that has a specific definition and when used, means a certain thing. But when misused, it drives real scratchbuilders crazy. It's like a person baking a cake from a Betty Crocker mix and frosting it with frosting out of a can and entering it in a bake-off and saying they made it from scratch. Someone else in the bake-off who actually did make their cake from scratch is not going to be very happy with the Betty Crocker person going around claiming that their cake was made from scratch.
And I used the dictionary in my post because the dictionary is the "referee" as far as correct usage, spelling and grammar. If we didn't have an accepted "official" source, and no rules for grammar, spelling, etc. at all, we'd all be speaking and writing our own version of English, and odds are most of us wouldn't understand each other.