So normally you want windows to let light in (often also air, but only temporarily and from a certain level this is secondary). And basically as many as possible. In the past, windows were not as good as today and were rather smaller in our latitudes so that not too much heat was lost in winter. Today, you don’t really have that problem because windows usually insulate quite well. Most people want as much natural light as possible. Because natural light saves electricity, creates a friendly atmosphere, “opens up the space,” improves mood and is (regarding running costs) free. Sometimes you even have a nice view.
In this respect, I would always have as much window opening as possible.
Sometimes use limits the position of a window. This restriction usually happens horizontally. For example, furniture you want to place, things you want to attach to the wall, or pipes that have to run inside the wall. The sill height also depends on use, or it is more a matter of taste whether you place a desk in front of a floor-to-ceiling window or prefer a sill there; that is rather a question of taste. But taste is also a reason—at least not being seen on your bare legs by neighbors or passersby is a comprehensible reason for a lower limit of the window. However, once you have defined a position, sill height, and width of a window opening for yourself, I can’t think of any reasons (except maybe technical or financial) not to make the window as high as possible. So, roller shutter box and maybe 2 cm tolerance.
That means if I were you, I would make 2.38 m the upper limit everywhere. If you could do 2.4 m everywhere. It could be that at a certain width and floor-to-ceiling windows the sash becomes so heavy that the window manufacturer wants to limit the warranty or something has to be reinforced. You can still consider slightly reducing the width of the main sash.
If financial reasons speak against it, I would first consider whether fixed glazing could suffice somewhere. With double sashes, this is almost always an option and saves a lot. Then possibly omit shading on north-facing windows. Saves even more—where possible. For windows in the upper floor that are hard to reach, omit protection class. Then width (but minimum 70 cm). Then height, but first from below and at most 1.20 m sill height (top edge of finished floor). Then height from above.
P.S.: As a last reason, one could cite chronic migraine or sun allergy, but then I would actually rather select room by room and not build just arrow slits in the whole house. Not because any norm requires it (to my knowledge it only requires 1/8 of the room area), but out of own intrinsic motivation.
I really don’t understand how anyone comes up with not wanting to get the maximum window opening without necessity. That’s why I am asking for the reason.