I think he's thinking more along the lines of PHP 5-8.5

That version 1-latest is understandingly highly different, but these are all decades old languages, which barely changed for some time, but are now all introducing new syntax.

Which I think makes sense, but it's obviously going to leave 9-5 devs behind that don't particularly care for coding and want to invest as little time as possible into their language knowledge.

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rytis 2 hours ago | parent [-]

And what exactly 9-5 has to do with caring for coding or time investment in language learning?

	▲	monooso 4 minutes ago \| parent [-]
		Not GP, but I assume the suggestion is that it's difficult to stay abreast of new developments within the constraints of a typical work day. Especially if your job utilises older technologies, as most do.