I like the "ideal" of a very clean and factory fresh finish, much like Des achieves with great success.
However my builds often have minor snags and flaws, which I then cover up with weathering! I agree, sometimes this can be over done, but I am happy that often an individual model can be used as a test piece for a certain technique.
To me, there are modellers who aim replicate the real aircraft in appearance and historical accuracy - this is great and what one would expect for commissioned pieces or for competitions. However for myself, and I suggest for many others, it is more a case of enjoying the build process itself, and occasionally having a good look over the finished models on the shelf. Depending on the quality of the photos, the readers on here won't see the models I build as clearly as I can, and my family aren't too fussed.
Now, for rib shading. I always try to examine wing surfaces when I go to museums. What I notice is mainly that the fabric appears glossier where it is stretched over ribs, but often (especially in PC10) the shade is the same over ribs and in between. CDL undersides often show slightly cleaner and glossier covering over ribs, and a duller tone in between.
Looking at the point about overdoing weathering etc, then yes this can happen. For example you would expect mud splattering and general grubbiness on lower wing undersides but I have seen an overdone model with upper wing ailerons just as dirty.
As for colour modulation, I think in 1:32 a model looks better if fabric areas have some form of variety in the colour or finish, as too uniform may be toy-like, but this can be overdone too. The difficulty (for me) here as with rib shading is that whilst the fuselage and wings can have modulation/shading/weathering etc then the model would look odd if these surfaces are then topped with glossy clean decals.
Ultimately, I sit in the "it's my model so I'll please myself" brigade. I am not going to worry too much over the accuracy of PC-10 or German mauve colours etc. I do however value greatly the variety of techniques that everyone displays on here, free of charge and willingly, that I and others can learn from, and choose to replicate or not.
I think the tone of the forum is right. If I or anyone else wants to research colouring/building/weathering etc and ask on here, many will offer advice. I have yet to see the threads descend into arguments which I see on other forums in other fields.