Ah I was thinking of applying one's position on science/metaphysics, which does get tricky. I think there's enough Mystery for people to accept they can be wrong in their beliefs...this starts getting us into morality though...
On the question of how much do you lean to arguments from philosophy vs empiricism, I guess it depends on what lines of argument/evidence one finds compelling.
I was watching a video with physicists talking about time and one of them put it in an interesting way, something like, that time is not really a thing-in-itself, rather, time is the concept, the sort of category we use to talk about, think about, relate the state of the universe. So, I'd think it's sort of "all about" relative motion, in that sense. So, if nothing ever moved, nothing ever changed, then of course, there would never be anything like time.
Indeed though, if time is sort of "about" motion, than it makes "sense" to me that space and time being "one thing" is, of course, a fact. Although, time, as experienced, seems to almost certainly be, in my mind, just that, something of the mind.