He is a cook. Thats his job title. Anything else such as fighting, tactics, leading the crew is secondary in his resume. Oda couldnt be anymore clear than chapter 891.
Luffy: They think I will beat you
Sanji: They think I will make the greatest cake
You want more?
"Listen to me, Bege...You're free to assassinate her. But dont you dare to do it until I've satisfied my customer.
When someone is hungry I feed them. Thats what a cook does"
He refused to kill a dangerous opponent to fulfill his duty as a cook.
Why are you a fan of Sanji when you cant accept the fact that he is a cook?
Luffy: They think I will beat you
Sanji: They think I will make the greatest cake
You want more?
"Listen to me, Bege...You're free to assassinate her. But dont you dare to do it until I've satisfied my customer.
When someone is hungry I feed them. Thats what a cook does"
He refused to kill a dangerous opponent to fulfill his duty as a cook.
Why are you a fan of Sanji when you cant accept the fact that he is a cook?