What is the point of this thought process? centralized time-sharing -> decentralized applications -> centralization with web applications (or cloud) Like next

What is the point of this thought process? centralized time-sharing -> decentralized applications -> centralization with web applications (or cloud) Like next model would be coming from previous one or somehow created by some architect and like one or the other would be superior. There is no such causal relationship, each model was or is best for its time and technical possibilities. If it would be possible to have decentralized applications running on PCs in 1950 people would do that right away. Centralized time-sharing systems were necessity because computers were freaking huge and slow, remember that people did not have network connection to mainframe, they had terminals that were scarce and rather close to huge boxes that were mainframes. Decentralized applications running on PCs were necessity because we there was no ubiquitous networking in the 80's-90's, while computers got small enough that basically everyone could have computing possibilities at his desk, not just dumb terminal. There were still quite some mainframes around because they were more convenient for huge calculations than whatever was possible on the desktop. Nowadays or since 2000's we have really capable machines on desktop and internet started to grow to enable centralization that people want. Not like centralization that was necessity. I can do my calculations or a lot of work done on my desktop but I can easily share that work with someone on the other side of globe and thanks to centralization I don't have to wake him up but he can check his email when he finishes his morning coffee. So it is not back or forth, those are totally different modes of computing enabled by different possibilities that we have because of technology changes.