Self-proclaimed jack of all trades
It was. Back when RGSS series only up to RGSS2, people were spit into two group of RMXP and RMVX because both were flawed. People were insisting to use XP because of superior mapping, VX only had fixed tileset. But it has nice script structure that compatibility is even higher in between script and it also has pick faceset in display message. And simpler mapping sells better for those who lazy to map. People were argued with their preference, and rm2k/3 users could just say "Well, I use eventing".I think ACE release is when there was the biggest boom of rpg makers?
The time Ace was released, it was revolutionary that previous flaws from VX was gone, and it really the VX should be. With new convenient databasing, damage formula, a neat script structure allow more flexibility that in my view it unites the RM users. Now with the release of MV, I could even say the structure of the engine itself is pretty much the same. RGSS3 default script structure and js files are pretty much the same, but with difference that MV got more QoL update on its editor and update support that was never been done in older version of RM.
As for resources, yeah we were using VX standard resources and we can also use XP one too. Effectively adds 2008 to 2015 worth of community made resources. MV only has 3 years so far.
But I have no idea how people would still stick on the old rm2k3, I wasn't there during the era so idk.