It's not really about new-old compatibility but I got used to all the functions it offers and how the variable stuffs work. Break the old ones for what I care, but make it work the same in essence.
I thought the same when Spaceguys Wrench Events got overruled by the current event system.
I hated this new system, but looking at it now makes me realize the new system is 1000 times better.
So don't be too dismissive if the new VCE works differently, it might be better then you expected.
All I want the new system to have is the ability to change other peoples variables.
Like how VCE worked before the update where every brick owner has it own subsystem of variables.
I know it was to prevent people from "hacking" your game by giving themselves gold or something.
But the gamemode which used VCE to it's fullest potential were gamemode where the regular player didn't have the ability to build, let alone access a wrench.
It made making huge RPGs hard to do in group as every time you evented a brick, you had to change the owner to the host in order for it to work.