So your argument is don't use an off the shelf tool (5 stages) that gets the job done, build your own tool (10 or 3 or none) every time which likely doesn't offer any advantage over the standard tool?
I don't think you really get either Design Thinking or Systems Thinking.
What you are talking about here is not Systems Thinking, which is a particular approach to understanding complex problems by viewing everything as systems of systems. Design Thinking is a methodology for approaching the design process, which is quite orthogonal to whether or not you employ Systems Thinking. The more general field of trying to understand how we determine whether something is true and what it means for it to be true is the field of epistemology; "epistemological based theory" is a meaningless description, like "philosophical based worldview".
Let me summarize your chain of arguments up to this point:
“I don't think you really get either Design Thinking or Systems Thinking”
1. In the strict sense of science, Design Thinking is not a methodology, whether you like it or not. Look it up.
2. If you have no more arguments to offer besides falling back to accusations again and again, then I'm afraid I can't take you seriously.
I'm not arguing anything here, I am trying to help you realize that you aren't talking about what you think you're talking about.
I am not referring to methodology "in the strict sense of science" indeed I don't know what "in the strict sense of science" is supposed to mean. I'm using the dictionary definition of methodology: "a body of methods, rules, and ideas that are important in a science, art, or discipline : a particular procedure or set of procedures."
> I am trying to help you
Quite the opposite. You are now trying to reframe your accusations as help.
1. I surely didn’t ask for accusations nor for help with this. If I need any, I will let you know.
2. Your assessment of my situation is incorrect and as such I'm removing myself from this conversation now. But I want you to have the last word, so, go ahead.