Always_Ask_Questions,
“Imagine, melech Shlomo is coming to your house and you proudly serve him a bishul yisroel tuna sandwich. He might just turn around and decamp to the nearby house that serves a halav stam cake”
Fish and bread are more prominent meal foods than cake. If you invite me to your house for lunch and serve me a tuna sandwich, great. If you serve me cake, I’d still be grateful of course but I’d think our definitions of what constitutes lunch are different.