Is it grammatical to say "... is both popular and has presented ...'

Question

This particular example comes from a peer-reviewed publication with authors who seem to be native speakers:

This trend is both popular and has presented a variety of challenges

I wonder if this is grammatical?

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If this sentence didn't have "both", we would parse it as follows:

This trend ((is popular) and (has presented a variety of challenges))

But with "both", what do we have?

This trend is both ((popular) and (has presented a variety of challenges))

but this gives us "is has presented", so this parsing is incorrect. Alternatively, we could try

This trend ((is both popular) and (has presented a variety of challenges)).

but then "both" goes inside the first coordinate. This is different from, say,

You and me both

where it's at the end.

Answer 1

As Huddleston & Pullum (2002) note, while both and either typically occur at the start the first coordinate in a coordination, they don't necessarily do so (p. 1307). They give the example:

Usually he is either too busy to come with us or else has no money.

They say that "placement in these non-basic positions is quite common, particularly with either, though usage manuals tend to regard it as stylistically undesirable." I would agree on both points.

Answer 2

Sample: This trend is both popular and has presented a variety of challenges.

Answer: Yes, it is grammatical.

A be verb (is) as copular followed by active verb with direct object. That is not parallelism

That sentence is both grammatical and unparallel. You can remove the word both and it remains grammatical and unparallel.