To me, deep and broad aren't mutual exclusive. My take is that well read persons are, to use the technobabble du jour, "tee-shaped".

Or rather double/triple/quadrouple/n-ple tee-shaped having read broadly across many fields and comparatively deeply in more than one. Relative depth in multiple areas becomes easier and more likely with age as interests change and realized opportunities to read to greater depth accumulate.

Reading deeply requires time. Reading broadly requires time. Neither has a shortcut. Neither precludes the other given a lifetime.

Depends on your goal IMO. You can't do both - it's something I've struggled with in my life so far... Interested in too many things to become an expert at any one

Well, I think you can't do both with all of the things. Figuring out priorities is surely one of life's biggest challenges for those of us with many interests.