You gave your friend great advice. I find Best Buy a great place to buy stuff that I have researched and decided to buy… for instance my Sennheiser Ambeo sound bar from my bedroom. 24 month financing and a good price.
It is great if your friend likes what he got. If he followed your advice then he would have a better sound ing system. Features are the bread and butter of low fi. High sound quality and few features are the mark of high fi.
Fortunately the BB guy sold him B&W and Denon… it could have been much worse.
You can lead a horse to water….