Challenge accepted. 
Probably a matter of context. I think Flame is great and above any other software (including Nuke) in many aspects. But I do have to agree Nukeās Deep Compositing and Multilayer paradigm are simple reasons to choose it over any other comp software for CG work.
I have worked with CG passes and multilayer EXRs in Flame and found the amount of steps to do the same basic operation are greater in Flame. If you have just a few layers is fine, but when bringing in hundreds, progress gets slow.
I bet Deeps are not a big deal for many of the work gals and folks here do on a daily basis (and thats ok) , but I use them all the time for the type of work I do. Comping without them just doesnt make sense. Not because I cant do the work otherwise, but because it so much easier and faster.
Donāt ask me to comp this shot in Flame please (2:50)
Dont ask me to use Shake either 