In case you didn't know, the upcoming Mordenkainen Presents: Monsters of the Multiverse is almost entirely reprints of existing races and monsters. I've already detailed how I plan to handle the player races in
this post.
So this post concerns how we want to handle the updated monsters. The vast majority of them are updated to adhere to WotC's deisgn goals, such as removing spell slots (replacing them with innate casting).
The 2021 Errata also makes similar changes to some monsters in adventures, like Storm King's Thunder and Tales from the Yawning Portal. And we have been told to expect a similar Monster Manual overhaul in 2024, essentially as a 5.5e for the game's 50th anniversary. And on top of all that, there are errata changes to SRD monsters that we cannot easily fix in the Community Pack.
With all that in mind, I want to know how y'all would want to see these changes handled. Do we treat updated monsters as their own versions, or do we update whatever we can, replacing the old versions? Let me know in the poll and comment in the thread with your thoughts.
I want opinions; I can't promise I'll go with the majority (sometimes coding may force my hand, sometimes I may find a better way, etc.), but I at least want to know if my preference is wildly different from everyone else's.