Many companies have downgraded from real applications to websites so that the client does not matter.
Folding devices are sold enough for them to keep selling them. You would have to have enough disposable income in order to afford the devices and I am around students and professors daily so that would be a limiting factor in which people would purchase these phones. I guess in Mountain View California, these phones would be used a lot more than in the rest of the country.
You would replace a computer with a smartphone with all of your data in the cloud because it would be easier to use while mobile than a notebook computer where you have to find a desk in order to effectively and efficiently use the computer. The same would be for using a tablet computer over using a notebook computer, but you have a larger screen. If you just need organization and productivity applications, then those are available on all devices that work extremely well. Do smartphones and tablets do 100% of what a notebook or desktop computer does, no. Notebook computers when introduced did not do the same things as desktop computers, but today they do. Neither did tablets and smartphones when they were introduced. With the downgrade to websites and the increased computing power of smartphones and tablets they can today for most people's needs because most people's needs are basic enough that smartphones and tablets can perform all what they need. There are only a few use cases where a computer is still required because the software is not available on a smartphone and tablet.