Science is a branch of knowledge. In fact, its Greek root means "to know". Philosophy has a whole sub-field called epistemology that concerns itself with how we know things, what it means to know things and what can be known. Are you not in the least concerned or interested as to whether scientific knowledge rests on a firm footing? It's one thing to say that you personally don't want to devote any time or thought to philosophy, but that doesn't make it irrelevant. It seems to me that all you're saying is "It's not my concern. I'm more interested in other things." So, that's just an expression of your own personal focus, nothing more.