Being that I like to test stuff, I did some testing.
Everything seems to work alright for me. The D9 bootloader works just fine and was able to dump and restore my NAND without breaking my system. Other features worked as well.
The Lima3DS CFW itself booted up just fine. Of course that's be expected, but I also had to make sure other basic features were still working.
So I launched me some Kingdom Hearts Chain of Memories to test out the GBA and it worked! As well the GBA boot splash worked when told to work and didn't show a bootsplash when told not to. Simple stuff, but since the payloads paths were changed, it's always worth checking.
DS Mode was tested with an R4i Gold Rev7 worked just fine
Pirated DSi games were tested with Shantae: Risky's Revenge. Worked as well
Hacked DSi: TWL Slot 1 launcher, launched without a hassle
Homebrew CIAs: tikSweep launched and cleaned up some uninstalled games without hassle
Region Free: Dragon Quest 7, EU on US system: Worked just fine
High Memory Mode: Monster Hunter Generations: Booted and rebooted when game was closed (normal on old3DS)
So basic functions all seem to work just fine, this including all the basic functions for D9 and Luma. I would complain about them being detached features, but this isn't even Alpha. But it does appear anything using High Memory mode (DS(i), GBA, MH/Smash) all reset to the bootloader, which is kind of annoying.
@Billy Acuña Also have you considered using something like CakesFW or corbenik? I feel like integrating D9 into their menus might be easier as well open up more options. Plus with corbenik, you already have a bootloader that supports backgrounds, from there it's about about making a fancy theme.