With the downside that your saves borked to hell and back.
URM doesn't bork saves unless you make a huuuuge mess with the variables, what is unlikely. And the multi mod never gave me any trouble with the saves really, LightmanP is a good modder and usually fast even though puts it behind a paywall in the first 2 days, most the times I can load a modded save that works in a unmodded game, may not be the last I did but always find 1 that works and finds a place to rollback.
I also save often in different slots what is a good measure if a save can't find a place to rollback but I do that in every game still in development because changes can happen from one build to another, it isn't needed a mod for errors to happen, all it needs is the developer change the code or renpy version or even renders/dialogue and will happen. Also there is plenty of mod users that are careless and don't install it properly, most the times is an user problem and not the mod itself.