People say the v.1803 April 2018 update .ISO is not stable: "build itself has its known issues with various configurations - the Internet is full of reports."
There are currently an estimated 600 million Windows 10 users out there. You say the Internet is full of reports, but when you look at the big picture, only a fraction of a percent of those 600 million had problems. But 1/2 of 1% is still 3 million users and 3 million unhappy users can make a lot of noise - especially when that noise goes viral and is amplified when bloggers, MS bashers and the IT press parrot those reports over and over again.
And there is a BIG difference between Windows Update issues and "stability" issues afterward after the updates. Since Windows 10 came out, out of the 6 systems here, there have been less than a hand full of times where I had upgrade issues with 1 or 2 systems here. But all soon cleared on their own, typically with a simple reboot. I have never had the need to roll back (or stay back) because an update cause stability issues.
To my point, all systems were "stable" once the update properly completed. And as a shop owner/tech with my ear to the ground, I can honestly say my personal experience is typical of the vast majority of users out there.
It is also my experience that the folks with the most problems usually (not always, but usually) fall into one of two categories. (1) Users with older systems, early Windows 7 systems that were upgraded to W10 and (2) folks who resemble those described in Vayra86's post #5 above. That is folks who think they know better than the developers at Microsoft and who dinked too much with the default settings.
Consider the fact virtually every single Windows computer out there becomes unique within the first couple minutes after first boot! We setup our user profiles, custom desktop personalizations, and networking. We install and attach all sorts and configurations of hardware (graphics cards, monitors, drives, RAM, keyboards, mice, etc.) from 100s or even 1000s of different hardware manufacturers. We install our security programs, browsers, favorite applications and more. Frankly, I think it amazing more people don't have problems.
I sure don't like and have been very vocal about some of the marketing schemes and policy decisions made by MS executives. But frankly, I think the Microsoft and specifically the Windows 10 developers at Microsoft are doing an awesome, outstanding job!
fortunately or unfortunately it's not always the case 
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