Quite seriously, there will be whole categories of bugs you won't catch with a debugger (same way printf or CLI execution etc. have their limitations).

The debugger will never be completely transparent, it also eats resources in parallel to your application, and peeking into the session also introduces timing issues, short of the debugger itself having its own bugs.

I'm saying it would be dumb to dismiss all other tools for the love of debuggers, it's just one tool in the toolbox.

Complicated enough for what?