Does the term "post-watershed" make sense?

If we were to regard a watershed period as a period between two distinctly defined epochs, would the adjectives

pre-watershed

and

post-watershed

be instantly recognized (by readers and/or listeners) as pertaining to, respectively, the former and the latter?

As in:

This is a post-watershed novel.

That's a pre-watershed painting.

I don't remember ever using pre-watershed technology.

To clarify:

Before the invention and commercial production of the paint tube, outdoor painting (known as en plein air) was rare. Paints were mostly made in the studio, either by the artist himself or his workshop, and difficult to transport safely.

A brief watershed period followed the introduction of the paint tube during which many artists found themselves adjusting to the new possibilities, after which landscapes were suddenly all the rage.

New techniques appeared and took root despite the numerous objections of some conservative critics. Today, some post-watershed paintings are valued as much as those of the Old Masters (including the entire French Impressionism movement).

Or is there a better term?

To regard 'watershed' as meaning only a 'period' between epochs would seem to be at odds with Cambridge Dictionary, which gives the meaning as:

an event or period that is important because it represents a big change in how people do or think about something.

Or, if you are that way inclined, Oxford:

An event or period marking a turning point in a situation.

Regarding whether 'pre-watershed' and 'post-watershed' would be instantly recognised as referring to periods before and after some event or period, that, strictly, is a matter of opinion (or a survey), but, given comprehension of the 'pre-' and 'post-' prefixes, and the meaning of 'watershed', I think it's likely that understanding would be pretty rapid.

'Watershed' is, of course, a geographical or topographical term being used metaphorically to refer to a dividing line in time rather than in space. It's not, in my opinion, a very good metaphor, as ground water runs away from the watershed because of the lie of the land, whereas events themselves determine what is a watershed in history. Pre-watershed and post-watershed smack to me of mixed metaphors, but I know that this is pedantic.