One thing about foldables, especially the versions like this purported Google Pixel Fold, that offer a full sized outer screen is that they’re doing so because they know the device doesn’t make sense if you have to unfold it every time in order to use it. They include the outer screen to make the device more like a current slab device that just so happens to also have a larger inner screen.
And that added screen drives up cost and reduces battery size (to fit in the added screen hardware). So they’re making two devices in one, just for the “convenience” of being able to carry a phone and mid-sized tablet in their pocket.
Like any product out there, there will be a subset of consumers who see this is exactly what they want and need for their particular use case, but I would venture to guess that it will always be a small portion of the overall market. Between the cost and fragility of the folding screen, it’s a niche product category.
I’m more than happy to carry a smaller smartphone for the quick and easy call, text, email and various web/app interactions, and have access to my iPad Pro for when I need to do work (using a physical keyboard) or for watching videos.