Unfortunately in Linux, UI tools often take away some of the transparency you get with the CLI tools they're made for.
I've recently tried setting up a VPN connection to my workplace using the EndeavourOS configuration UI. It basically just said "can't connect, haha, fuck you", so I had to dig deeper. Finding out how to use the CLI commands necessary to identify and fix the problem took some time and effort, but in the end, I managed to set it up successfully (turned out most Windows admins still think l2tp is hot shit while the Linux world considers it obsolete).
In this case, UI wasn't as user friendly as CLI, because it hid vital information that was necessary to solve the problem.
A better UI would probably have solved that problem quicker and easier. In an ideal world, you get intuitive GUI tools that cover all use cases and you still have the option to use the CLI if you want to dig deeper. So yeah, I agree with the point you're making - Mint trying to be as user friendly as possible by offering accessible UI tools is a good thing and one of the reasons why Mint is so popular. (It's also a reason why Windows sucks ass, because for most UI things the CLI equivalent is either non-existent or cryptic as hell...)
The point I'm making - GUI tools should always try and make using the CLI unnecessary. Taking away complexity without taking away functionality is the key, and as a consequence, those GUI tools will not be underappreciated for sure.