Jay Maynard wrote:
There's at least one LSA manufacturer that claims LSAs
can't be legally flown IFR, but I strongly suspect that's because they
don't offer one.

Sport Aircraft Works Inc. may or may not be who you mean, but I've seen
them make that claim in the past. Here's their web page (which looks like
it has been changed since I've last checked, so it doesn't read as absolute
as it used to):

http://www.sportaircraftworks.com/ot...%20CRUISER.htm