Implementing a new system is extremely difficult. People teach people to do things the way that they do things, and people do things the way that they were taught to do it. Creating a clean break would require you to (1) get people to change what they do, (2) prevent people from teaching what they know, (3) teach everyone the new thing, and (4) continue to teach the new thing.
Those last two aren’t too hard, but those first two are nearly impossible. It’s not like a video game where you can press a button and suddenly your civilization has a new language.
This is why we still have things like metric/standard, C/F, or spelling differences for words (color/colour).
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