That's why everybody programs in base notepad, with no syntax highlighting or auto complete or live error notifications or linting or any other quality of life feature.
What you say here is true. Writing code is not remotely the hardest part of software engineering. But that does not mean that there is zero value in making it easier.
Shifting gears is not remotely the hardest part of safely driving a car. Yet automatic transmissions are a nice feature for tons of people.
I do not understand this dismissal based on the fact that copilot does not completely revolutionize software engineering in a way that no other product has ever come close to doing.
The challenging part of coding is converting domain knowledge into correct code.
An AI has no high-level understanding of the domain and desired solution. It just guesses at what you might want and glosses over all the edge cases and exceptions that actually need to be considered and resolved. The issues that only come to light after a real intelligence studies the problem, and works through correct steps to implement a solution.
It's an iterative process, because the solution is arrived at only after attempting a solution, learning what you don't know or haven't considered about the problem, then resolving those ambiguities, and producing a revised and more correct solution.
When responsible programmers realize that they don't know what they don't know, they ask questions and apply the answers.
AI never realizes when it makes mistakes because it has no domain knowledge. It just pulls a best guess out it's ass and says, "Here you go. Check my work."
Maintaining it is.