I think the problem is that 'normal' cycling gear, and 'cycle specific' trousers are both ways of describing bib shorts. Commuter wear isn't cycle specific, it's a compromise between functionality and 'not wearing lycra' that just so happens to be marketed as cycle wear. They will be made with some benefits, like the non stretch, reinforced fabrics you mentioned earlier, but they're essentially just 'clothes' rather than 'kit'. When I realised that the idea of spending a premium for fancy 'cycling' brands, or any 'active' clothing rather than specialised kit, went out of the window for me.
I think the problem is that 'normal' cycling gear, and 'cycle specific' trousers are both ways of describing bib shorts. Commuter wear isn't cycle specific, it's a compromise between functionality and 'not wearing lycra' that just so happens to be marketed as cycle wear. They will be made with some benefits, like the non stretch, reinforced fabrics you mentioned earlier, but they're essentially just 'clothes' rather than 'kit'. When I realised that the idea of spending a premium for fancy 'cycling' brands, or any 'active' clothing rather than specialised kit, went out of the window for me.