"Should" look like is a matter of opinion.
That's up to you, and what you like.
But it's a historical fact the Silkie originally looked quite different from the modern American SQ Silkie. And that's not because of lack of breeding, they were maintained that way in China for hundreds and hundreds of years.
The original Silkie had a smaller crest, more of an upright posture, less leg feathering and beard... They had black skin, blackish flesh and comb, white feathering, five toes, and vivid sky blue earlobes.
Illustration showing Chinese Silkies in the mid 1700s
They were traded several hundred years ago to Japan where they were called "Ukokkei". Over time the Japanese version of the Silkie has started to look a little different from the original Chinese bird. Silkies made it to Europe, England and America mostly starting in the 1800s (a few were recorded in the 1700s) when sailors and world travellers brought them back from Asia. Once again, national tastes and the poultry fancy have slowly changed the appearance of the birds. The extra fluffy American silkie really took off over the last 20-30 years. Before that Silkies with smaller crests were the norm, even in the U.S. Old timers I have talked with have also said that not too long ago, Silkies with a much darker skin were quite common. Now people seem to be casual about some of the distinctive Silkie traits the breed has always had... focussing instead on new colors brought in by crossing with other breeds, and extra fluffy feathering on the foot and head. I have bought several Silkies from a show breeder that have almost no blue color to the earlobes. Seems to me the only way you would suddenly lose a trait the breed has been famous for for centuries, is by reckless crossing with other breeds that do not have the trait. In the 1800s, the ears were so bright that some texts erroneously stated that they glowed in the dark.
Meanwhile, over time British show Silkies have gotten rounder and blockier in shape... European Silkies have gotten pouffy crests but they seem differently shaped than the American version... no-one's Silkies have stayed exactly the same, but I think you could look at photos and say the American SQ Silkie looks like it is the farthest from its origins.
"pure" modern Chinese Silkies from the state Silkie preserve...
...more Chinese Silkies
Ukokkei from Japan...
Sure, hatchery Silkies may have their own issues, depending on the hatchery. Anyway, this thread is basically a celebration of hatchery Silkies and heritage style Silkies, for people to share pictures