I’ll try putting it differently than I did before.
(The Blue/Red/Legs example did get it really well from another angle, though.)
Let’s consider a similar question that’s been asked here before, “Are squats push or pull?”
But rather than worry about that – on the one hand the traps are pushing against the bar, but on the other hand Bill said not to make such things the deciding factor, so let’s see what muscles are being used… hmmm, largely the same as the deadlift so what, does that mean I do them on DL day? – you look at the practical aspect of what works for you or what can be expected to likely work well for you.
Depending on what the rest of the program is and depending on the person, doing squats on the same day as DL can be a great way to go.
For another person or another program, it’s not the way to go.
Not because of being “push” or “pull” but because of factors such as whether the lower back for the individual person does well with the amount of volume involved in training both squat and DL hard in the same day, and/or the overall frequency of the program.
Same here for upright rows.
There could be situations where you do them on same day as upper back exercises even though your shoulder work in general is on another day. This could work fine if you like the shoulders being “hit” on two different days in the split and everything else also went along well with it.
It wouldn’t be the usual way to go: usually you’d do it on the day shoulders are done.
The decision as to which way to go wouldn’t be out of “push” and “pull” but on entirely different factors such as whether you wanted to have that extra frequency for the shoulders.
If just splitting two ways then there really isn’t a question about it: same day as shoulders in general.
