Latin is to parchment as

The Morse code was to telegraph.

Both were an adapted, and fixed symbol set designed to optimize transmission on a fixed bandwidth channel. They are both Huffman codes.

If you have parchment and want to run a world empire what do you do?  Make a symbol set that can define government activities in past, present and future; with ongoing or completed actions, including some conditional action.  Then build everything from a stem word, hire the scribes to create the accurate code.  Contacts become understood, they are simple, fixed structures, easily adjudicated; all on sheep skin.

They used to teach latin in the catholic school, and latin worked for the catholics for quite a while before they gave it up  The prefix and suffix system is very much like a symbol boundary. And they provide all the modifiers of the stem word to clearly define the intent n the sheepskin.  You don;t throw sheep skin in the trash the way we do with paper.

Notice in spanish, all the irregular verbs are the commonly spoken and modified for the illiterate derived from vulgar latin, the latin spoken by those who couldn't afford sheep skin. SO absent parchment, we can see a verbal only language will diverge to a variety of symbols based no simplifying the spoken word.

How did those Roman peasants figure this out?  Likely some middle easten scribe had this idea and sold it to them and they ran with it.