Yes, indeed interesting. For that old mono sound you have to arrange a bit differently to have it sound good. And of coures backe then you could nowhere near mix recodings with multitracks as we used to today. As far as I remember Morgan & Stromberg almost always extended the orchestra and especially strings for there re-recordings for that reason.
For the same technical reason a lot of action music nowadays sounds so generic because you don’t really hear it anyway with all the sfx. Not to speak the last minute re-cuts requiring music you can easily cut/loop… Film music always had many techical aspect interfering with the “musical” as we discussed on other topics.