You'll find i'm not.
Have a look at for instance: "So the poor quality of some systems and formats is fine, as long as we can decide to use or not to use them."
So, how do you compare a portrait made by 35mm on EI 400 film,
at 1/60 @ f/2.8, with, say, an 85mm lens ?
How does 6x7 compare, in simple detail, to the inferior smaller film size ?
Let's make it easy. To match the depth of field and image proportion, 6x7 will have to shoot a 48 x 72 image, and a 165 ish lens, with a 30mm aperture, or f/5.6.
To shoot at f/5.6, you need to expose the shot 1/15. So, if you're betting your mortgage payment that you're coming home with a high quality image, are you REALLY going to shoot 6x7 instead of 35mm ?
Since 35mm TMY2 makes grainless 11x14s, and CAN make grainless 16x20s if you know what you're doing,
and since an 85mm lens can record all the fine facial detail you will need in a great portrait at f/2.8,
what does the 6x7 offer you beside 4 times the image movement and camera motion ?
How about shooting a 50mm lens at 1/15 @ f/1.4 with 400 film ? A portrait like that paid MY mortgage this month. You WANT to
try to shoot 6x7 at f/2.8 at 1/4 ?
If you make the assumption that you want to use the best equipment for the job at hand,
you may well find that a 35mm can outperform other formats for sheer technical capability
in some conditions,
and in some conditions, 35mm is inferior.
Context is what matters. In a few circumstances, a cellphone will outperform an 8x10, or a Hasselblad.
If this isn't a viable argument for you, well, so be it.