[unconed]

The old fogeys don't rely on printf because they can't use a debugger, but because a debugger stops the entire program and requires you to go step by step.

Printf gives you an entire trace or log you can glance at, giving you a bird's eye view of entire processes.

[oblio]

Most decent debuggers have condițional breakpoints.

[jcparkyn]

Not to mention tracepoints (logging breakpoints), which are functionally the same as printf but don't require compiling/restarting.

[scarface_74]

And have since the mid 1990s at least…