Simple is not Easy
"Simple" does not equate to "Easy". Most 6-year-olds can attest to this, as they labor over the arduous task of cleaning their room.
Simple can be harder than Complex in many ways. The psychological "free pass" of complexity is the most fascinating way that simplicity is harder than complexity.
When we do something simple, fewer variables can go wrong and fail. Failure in this case is usually down to execution: did you do it correctly, with diligence? If so, then you'll probably succeed. This is true in software, physical fitness, mental health, and perhaps countless other arenas in life.
Compare failure when dealing with complex matters. Failure can come from anywhere when dealing with complex matters. It can be due to any of the variables themselves, it can be due to how 2 factors interact that weren't predicted properly, and it can be due to "unknown unknowns"—things we can't possibly know until we experience them.
These additional failure modes lend an air of mythos to more complex solutions.
They trick us into thinking they're better solutions.
Psychologically, it's much easier to give yourself a free pass when so many of the failure modes are "out of your hands".
Subconsciously, it's why we like complex solutions. They give us psychological safety that we can point the finger at something other than our effort when things break down.
If I have ADHD, then my lack of focus isn't my fault—it's just how I'm wired. But if I'm just not forcing myself to focus, now I'm responsible for my failure.
If I have kids, then my lack of effort isn't my fault—it's due to how little time I have and how tired I am. But if I'm just not working hard, now I'm responsible for my failure.
Psychological safety in these cases is detrimental. Not good.
Rarely are complex solutions superior to simple solutions. Simple solutions, by their nature, have fewer failure modes and thus tend to have a higher success rate.
You see this pattern in life frequently: the harder path is more successful. So despite "simple" being a pejorative many times, it is actually a harder path and thus is usually more successful.
Ruthlessly eliminate complexity. Focus on simplicity.