I'll take "things you should never do" for $1000 Alex.
https://www.joelonsoftware.com/2000/04/06/things-you-should-...
Joel Spolsky wrote that about "large scale commercial applications", which Monica definitely is not.
IIRC the monica team already did this between v1 and v2, so v2 to v3 as another rewrite would be the same move.
that made sense when people painstakingly typed out code by hand. Nowadays the code doesn't really matter and can be trivially thrown away and regenerated as needed.
Can't help but notice that this line is not true anymore in 2026: