Late but oh well.
To each their own. For pet dogs I don't see a problem in not. For protection breeds that will do the work, Dobes, Rotts then absolutely dock. Tails make dogs easier to hold.
They docked field spaniel breeds because all that hair and severe brambles did not mix.
As to dewclaws, I've seen a firmly attached dewclaw rip off a dog a few times. Uck. When I get a pup, shape, angle and size are taken into account. If it looks likely to snag during work it comes off. Better some pain young than a fence or log or other situation tearing it off later.
Athena does not have front dewclaws now because hers were at huge risk of snagging and the vet agreed.
Purpose and use of the animal have to be considered.
Umm, age at surgery does matter. In case you didn't notice puppies are born eyes closed and far far less neurologically developed than a new born human. They take weeks to even begin to develop the same neural function as a human child. So NO, it's not the same.
Please let's not confuse the species I revere as being human. They're not, they're better than that. They ARE physiologically, mentally and emotionally different and I like that about them.