So you want Ancestry.com to standardize the clip-art graphics and not allow anyone to use other ones, so you don't get hints for them? Oh, there would be hoots and hollers.
No American family has a coat of arms. True, some genealogy fraudsters began making them up in the 1960s and no few continue to this day. They are decorative, but not true coats of arms. A coat of arms was granted by a ruling authority to one person; they were not inherited except in rare instances where a widow or one son was allowed to use an altered version of the original during their lifetimes.