I reckon 90 percent of 1990,s DMD games don't have the last and updated version of the factory Roms.
It equates to gameplay wise, to buying a brand new Stern and never updating code.
Both home users and operators were too lazy to add the latest Roms or didn't know they existed.

Anyone and everyone should look on the Internet Pinball Database and see what the latest rom is for their pinball machine. It can make a big difference and it really does finish the code and adds so much to a game.
Check all your machines and see what Roms you have.

I know that unfinished code on a game like Cactus Canyon is one thing, but games with the first ever Roms in it compared to the last ever programmed Roms feels very similar. Hope it helps.