In the early stages of my career, or in startup life? Absolutely not. Very little relevance; XP/SCRUM were both covered together in a single 50 minute lecture, the rest of the PM aspects were tackling paperwork-generation methodologies like the "Rational Unified Process" and "Dynamic Systems Development Model", both of which I feel like would be _hell_ if I actually had to work within.

However, there were techniques (like critical path analysis) that as I've got more senior, started working at larger companies, and started stepping down the senior leadership path, I've started to see some applicability to. Not direct applications - they still need taking with a massive pinch of salt, and modifying for modern learnings in industry, but they do start to provide some value, even if it's just learning what the grey-hairs in the exec are used to seeing :)

Fully agree. There are huge nuggets of wisdom in old-school engineering. For example PERT is something that most people don't know about. But it's simple to apply in the real world. Get three estimates - optimistic, pessimistic and realistic. double the realistic, add the optimistic and pessimistic and divide by four. It's basically a centerweighted estimate - but it forces you to think about the the corner-cases and what could go wrong.

Lots of other old school stuff that we "just turning grey" people need to translate for the new kids.