Why would someone consider electrophysiology to be old school?

[Genecks]

I've heard and read a couple of times that electrophysiology is old-school.
Old school, I believe in this sense, would mean old-fashioned.

Why would someone consider electrophysiology to be old school?

Would it be a particular type of electrophysiology that is considered old-school, such as sharp electrode physiology? If so, why?

[Steffen]

I would not consider electrophysiology old-fashioned. Maybe it's a rather old technique and not as "fancy" as, e.g., fMRI, but you still can learn a lot from it. Perhaps the people calling e-phys old-fashioned only think modern techniques are suitable to learn more about the brain. For them "old" automatically means "old-fashioned". In my opinion, they are wrong.
Another way of thinking: old-school in the literal sense only means it's an old school. This would only mean that it's an old technique and nothing more. And that's surely true.
I don't know where you read the statements and maybe they really mean what you think they do. But maybe you just misinterpreted the meaning...