I get that it has to be soldered on or whatever, but I'm looking at faster RAM on Newegg right now, in brand names, single module DDR4, for ~115.
I really wanna buy Apple stuff, but stuff like this continually keeps me away when I finally get to the Buy page.
But that doesn't apply to the 27" Mac which has non-soldered slots.
A friend of mine upgraded his 21 inch one out of the box because Apple RAM pricing and turn around is terrible. However he damaged the screen ribbon cable at the same time. Happens a lot.
They gave me the laptop when the company went out of business. It was my Plex server until last year.