My issue with Luma3DS stems from several reasons
Lack of true choice. The user isn't allowed to choose features they want to use. It's all handpicked from them without very little input. I hacked my 3DS to allow me to have control over it with, not to allow some other team to decide what I can and can't do. I did have some objections towards the non-toggled features, but decided to go with CakesFW and Corbenik instead of voicing them. I mean, why get bent out of shape with something when I could just use something else. I didn't like how Luma3DS was turning out, but I had the option to leave it, so I didn't raise any objections.
Fast forward and I began watching a trend in the forums. Users started to attack devs in the name of Luma3DS. Which I then I made my blog about this
http://gbatemp.net/entry/the-state-of-the-3ds-cfw-scene.11957/
I made it clear from that day that the current CFW scene was going downhill and I've only been able watched it fall downhill. I've watched dev after dev leave our scene. I watched projects all apart and Luma3DS take their place. I watched the scene die until there was nothing left, but two and one everyone wishes was dead.
My last issue is the reality that I am not even allowed to express my thoughts on the forums. In fact no one is allowed to express themselves on the forums anymore. Say one bad thing about Luma3DS and suddenly you are some troll and up for mockery. People simply aren't allowed to dislike Luma3DS and they aren't allowed to defend themselves either. The scene is so consumed by this project that it's impossible to do anything else. Luma3DS has literally become a cult at this point and it's impossible to do anything anymore.
Now why do I hate Rosalina? Because if I am not going to use it, then why have it running in the background? I shouldn't be made to run something in the background that I am not going to use. I hack my stuff to get away from that shit. Coupled with the reality that the team can't even or won't even find a method to make it a toggle feature is just shitty. It's just "Nope! We ain't changing it." And it's worse for me knowing that there's no other options outside of the few willing to stick with ReiNAND. But like I said, the community seems to want ReiNAND dead