I think most audiophiles would be upset if an amplifier didn’t come with a remote and the seller didn’t disclose it.
If I were the seller I would have included a stock power cord and if that was overlooked I would offer to have some inexpensive ones delivered via Amazon at my expense.
If I were the buying I would be mildly annoyed if I didn’t have an extra power cord laying around as it seems like a very basic thing to include with a sale. The joy of waiting for a new amplifier to be delivered only to discover that it’s a brick for another day or two...
It’s an unnecessary hill that’s also not worth dying on.