The same way just because you have awakened modified genetics and a Raid Suit doesn't make you stronger than someone who doesn't have these.
Or simply ate an overpowered Devil Fruit.
Either way, the more you train, the better you get, adding more stuff will raise your current attributes and most likely give your a bigger arsenal in future.
It's simple as that.
You guys think Zoro would do the same things he did if didn't get Enma? Yeah, he deserved Enma, he can get stronger with it the more he uses.
The same way Sanji saved his family twice in Whole Cake, and after everything he had to live in his childhood, its more than acceptable he could get stronger without investing time of his life training and without making that much of a physical effort, BUT it doesn't mean he relies 100% on it, its just adding more to what he already has.
This all goes around goals, if Sanji had to ate a Devil Fruit because he thinks if he doesn't, someone may end up dying, he will do it, as he did with the Raid Suit.
Yet, it doesn't mean Sanji is completely dependable of it, its probably going to make part of his arsenal, the same way if you took away Zoro's swords wtf is he going to do?