Yep spot on.rise to your level of incompetence
do think a certain amount of technical knowledge helps build vision , visions that can work
It’s not like your technical knowledge is a waste.
It’s just that that’s not your job anymore.
It should give you an insight into how others are doing their jobs so is definitely a plank. As you say can also help sense check and/or inform a strategy.
Certainly as a leader if I know I’m incompetent in a technical area I need a trusted advisor to do that so it’s inefficient vs having that expertise. But also needing to be a technical expert at everything as a leader and not being able to manage / delegate effectively is a recipe for failure.