Psychology: If the only tool you have is a hammer, you tend to see every problem as a nail.
The type or nature of the problem determines the tool that needs to be used. Not the other way around. Every problem has tiny subproblems.
Distinctive tools for distinctive categories and distinctive areas (of life).
The process determines the outcome’s quality as long as your process is defined by having the outcome in mind.
Amateurs posing as professionals.
Most people using one tool for everything are just having fun with the process of building the (ideal) setup with that tool. I bet they rarely produce something out of it except the built system itself.