That's the point of this discussion though...LaunchBox shouldn't be dependent on whatever version it's own database is on and we shouldn't have to wait for it to be updated. It should use a user generated list.xml like almost every other front-end uses.
Right now I'm on MAME 0.225. I use Arcade64 with a non-merged romset. In Arcade64 it shows I have 9545 working and available games. I wrote a batch file to copy all 9545 files to a different directory. When I import that directory with 9545 files into Launchbox, I uncheck all the boxes (non-working, casino, mahjong, etc.) and set it to import all clones. Launchbox only imports 9508 because it's depending on it's own, modified metadata for MAME (which we don't know what version it's on). If LaunchBox didn't try to re-invent the wheel and instead just used a list.xml that I would generate myself from my chosen romset, I would have all 9545 imported.
And I get it, so what is a few roms don't import. But that's not the point...if I want to import 9545 roms and LaunchBox won't do it, then it's a problem.
And just to add, I've been a community member here for some time and have contributed plenty. This isn't an attack on LB or Jason. I love the software and use it daily as many of us do and I appreciate all the hard work he puts in providing features that the community wants.