I go even further on the simple note. I do Basses, Drums, sometimes FX. Everything else I mix ungroupped straight to the master.
I used to do something similar to this, but I think that's just too many stereo tracks to work with. Having that structure and consistency might be worth considering!
You still have to sift through the stereo imaging of the tracks regardless. i leave my groups WIDE ass open, but my inputs are tamed.
I go even further on the simple note. I do Basses, Drums, sometimes FX. Everything else I mix ungroupped straight to the master.
I used to do something similar to this, but I think that's just too many stereo tracks to work with. Having that structure and consistency might be worth considering!
Dunno, man. I don't like the idea of having to "sort" everything just for the purpose of grouping it somewhere. Sometimes I even do bass layers out of the bass group solely just because they have more high frequency content than basses themselfs. ... so they are eventually leads, right? ...but wouldn't it clash with the actual leads? ...and so the train thought goes on and on, carrying the inspiration away.
I do overcomplicate stuff like this, so I think it wouldn't be beneficial in my case. But yeah. For anyone at least a little bit sane it makes perfect sense. 
nah you have a point, you just gotta know what works for you. But making a bass sound out of the entire bass group and recording it, seems way gnarly and a great thing to consider. And another point to maybe use groups.
It seems you're easily lead down the rabbit hole though....and you know this lol.
The whole idea is that, eventually you will be doing things technically the same as every one else, because you will HAVE to do those things if you wish to control the tracks you make. I mean, every mix engineer literally is doing work in the physical space, so there will be some similarities when it comes to basic principles of sound manipulation.
Your organization helps with the work flow that you do.
And i will say this from a math, problem solving, and business perspective (pop is an MBA; and i am majoring in mechanical engineering) that, the less things you have to deal with, the easier it is to deal with things.
Just choose the level of stuff you want to mess with, and if you need to reorganize or overly complicate things, go ahead! lol.