[djmips]

That's such a laugh IRL for a lot of job types. Are surgeons fungible? Need brain surgery?, oh don't worry we'll get the orthopedic surgeon in here.

I feel confident there are software jobs where it's essentially as specialized.

[jamesfinlayson]

Very much so - I worked at a place that tried to make all testers easily transferable between teams because apparently testing is testing. Except they didn't go so far as to do it for the team that tested some ancient Fortran application running on obscure hardware because it turns out that testers can be specialised.