[arthev]

You're missing out.

For one, relying on information to surface in light-weight form means that - even if it surfaced - you would be behind the curve.

Secondly, it probably doesn't surface. A heavy book you engage with builds rich models: you don't get that from light-weight online content.

Thirdly, if you want to positively differentiate yourself, acquiring information others don't have is one method. Reading books others don't read is one way to get that information.

Anecdote: Feynman used to have others ask him to look at the integrals they'd been unable to solve, and he was often able to solve them - something he attributes to having read a different math book that presented some seldom-presented integration technique.