> Since tail only processes a single file at a time, tail -f on multple
> files just doesn't make sense.

That's funny; it makes sense to me - and, apparently, a bunch of other
people....

> If you want the merged output from many files just run multiple
> copies of tail -f in the background....

...and then how to suspend them all, and resume them all, together?

I suppose sh -c '(for f in file1 file2 file3; do echo tail -f "$f &";
done; echo wait) | sh' works, after a fashion.  But that doesn't ID the
file -f-generated output belongs to.

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