I disagree that it contains a kernel of truth, though I would agree that it truthfully identifies a malign surface growth that occasionally metastizes and, left unchecked, destroys the kernel.

I certainly agree that there are people who teach because they can't do, but I don't think that teaching because you can't do is even part of the kernel of teaching.

As for admins... this is a huge problem right now. They are threatening to destroy the host. But a healthy host does have a trim, effective, and dedicated group of admins.

I always considered that part of a much needed safety net for a professional where stagnation in the hierarchy is no option, but there are less positions at the top than at the bottom. So yes, a kernel of truth, but not necessarily a bad thing.

> It's a play on "those who can, teach" which was a marketing campaign in the UK, which somewhat backfired within the UK and became the saying "Those who can, do. Those who can't, teach".

Lol I think you’ve got that backwards!

The marketing slogan was a play on the common criticism of teachers which is a quote of Shaw from around 1900.