Because WordPress is so popular, most of the time, my clients already have previous knowledge about using it, such as how to write a new blog. Suppose they want to make some changes to their page, such as how to put a new image or video media. In that case, they already know about it because it's a big market, and there is a strong possibility they've had previous experience using WordPress. In the back end, WordPress is user-friendly because it's pretty familiar. If you have ever used a WordPress website and then checked another WordPress website in the back end, most of the time it has a similar interface. Moreover, many plugins add new features and suit websites with different functionalities. There has been a recent development for WordPress where they are going with a block system in Gutenberg, and that could be the future, so in general, I think it will be better and more modern.
I have never asked for any technical support because, most of the time, if I really need technical support, I can simply Google it, and some other developers or users would have already answered the question I have.
My advice to general users is to just use it. WordPress is pretty easy, and there are several free YouTube tutorials on how to use it. And if they have made a new website in WordPress, they can ask developers to give them a short tutorial on how to use it. In general, they can always go back to the Internet and find information on how to use it. Many users can install new plugins if needed because it's so easy. But when it comes to more specific functionalities, a general user needs to go back to the developer. I rate WordPress a ten out of ten.