From a first recherche I had to learn this first thing:
ClearOS ain’t Clear Linux. These are 2 entirely different operating systems.
I found Clear Linux’ official website.
Clear Linux OS is an open source, rolling release Linux distribution optimized for performance and security, from the Cloud to the Edge, designed for customization, and manageability.
Reading this, it is clear (ha ha) to me that this cannot be a replacement for Ubuntu or, to be precise, for a user-friendly desktop OS leader. Generic John Does don’t want a fast system (which sacrifices comfortability, proof #1 is Microsoft, because it is damn slow and yet successful) and they don’t care about security. Like at all. Last time someone told me their password, it was one of the most used words plus a single digit. These people seriously don’t care about security. (Until they are actually a victim of their own ignorance, but that is a different story.)
The John Doe guy wants
Any software that focuses on speed, will never be as comfortable as software that focuses on being simple and/or comfortable. That’s a fact.
Secondly, customizability is always a thing for advanced users, or at least users that not necessarily know a lot about computers but due to whatever reasons have to use it truly a lot. Not every Joe uses their computer more than 2 hours a day. Therefore, this Joe wants a streamlined experience, that does not need to be customized. Prime examples of trying to reach this goal are macOS and Windows. Both are very limited in terms of customization, because they try to streamline the experience as much as possible for the generic non-technical ape in front of the computer.
Conclusion: Clear Linux is nowhere near being a desktop operating system for the masses. It is light-years away.