Play Aedemphia and you will understand why it's a good idea to leave those heavy systems to scripts.
Ex : the menu is so heavy that the game take between 0.5 or 1 sec to respond when you change between submenus.
Also an a-rpg without pixel mouvement is... not recommended to do.
A-rpg's aren't the strong suit of the (normal) makers anyways tho, we got a whole maker for these.
Rm2k/3 was super slow for sure, but I think this is more about a new maker, just without scripting features.
And while that would, for a lot of things, be way less compfortable than now, there aren't that many limitations you would face, to actually need scripting.
And I'm activly doing (and did) both eventing and scripting, so it's not that I'm biased to one or the other.
I'm scripting my battle system and menu now, but I evented them before, both worked fine and was relativly lag free.
Got to consider that there are a lot of patches for the old makers, so unoffical stuff, for unofficial makers basicly, they help in terms of performance and limitations.
But yea, current generation maker without scripting would work fine, but would simply be less convenient.