What happens when identifiers change? Why it is EVIL? Hopefully an easy enough to understand example
7More details if you are interested in the debate
https://forums.nexusmods.com/index.php?/topic/9304318-oaab-data/page-14#entry108706918
and older similar ones
https://abitoftaste.altervista.org/morrowind/index.php?option=content&task=showblog&id=45&Itemid=73
https://www.reddit.com/r/Morrowind/comments/6zho87/tamriel_rebuilt_tr1709_public_test/dmyol7i/
abot AKA Cassandra/abitchoftaste
[EDIT] so after more debate and much testing, my current TL;DR idea of this is:
the OAAB_update tool works, but after applying it don't do a Mash repair all on the saves, be sure to reload the saves in game (ignore the starting error messages) and make a new save from there, then you can safely use Mash on the new saves
And yes, changing identifiers is still EVIL