I'm surprised that I didn't see hand fatigue mentioned, which is probably the number one reason cursive is actually useful, not that it is fast or "aided in cognitive development". Business scripts (like Spencerian in the early 20th c) were developed if you were Clerk or someone who had to scribe stuff out for hours on end, and it had to be legible and consistent. The mechanics of it are quite simple. If you hold a p…
I had many teachers who insisted on cursive, and none of them were half as lucid as you were just now.
Similarly, forcing left handed students to write with their right hand finds a rationalized basis in superstition, although it’s been explained that when a cultural custom forces a bias toward a specific dominant handedness by default, it benefits safety optimizations in aggregate.