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Bivvies are for:
>one night trips
>sunny dry daytimes with mild nights
>bike races and FKTs where you're grabbing a couple hours of sleep here and there
>mountaineering emergency camps on ledges
Everything else sucks because they're condensation traps (no, your magic marketing material won't save you, no membrane works when the DWR wets out and there isn't a sufficient difference between the vapour temperature and humidity on the inside and out).
If you don't have a way of drying your insulation and bivy out in the daytime, and each night it gets wetter and wetter (and less lofting), you will quickly run into trouble in cold rainy environments. And waterproof bivies are wayyyyyyyyyy too hot in summer unless you unzip them (in which case, why not just use a sleeping bag or a bug net under a tarp?).
So no, I would never choose a bivy for 99% of my trips, and you would struggle to find any distance hikers who use them.
