SHifters/levers against the grips isn’t a faux pas but it is indicative (tho not always an actual fact) that the user has not experimented with their setup and found what works for them. I’ve seen brake levers pointing up
I’ve had to point one up once just so I could ride a bike. OK, my arm was in plaster, and I was going stir crazy living at my parents house as an 18 year old with a broken arm (we lived miles from anywhere) and had been told not to drive, after a few days I just grabbed the Allen keys and pointed my front brake lever skywards so I could even attempt to use it at all…
The other brake lever “fail” if there is one, is nearly vertical. I was surprised just how much control this robs you of when I started pointing my levers upwards a bit more after some experimentation.
And as for the comment about if you want your levers where they feel comfortable, you can’t reach the shifters. I hear you… But then I’m one of the few people who still finds gear lever windows useful. Though I must concede I’ve taken the window off on my hardtail (with a 1×10) and run the shifter outboard of the brake lever and it feels a lot better, so I might just have to ditch the lever windows on my full sus too.