Yep, and it isn't just Subaru. Many other manufacturers have the same "not recommended" clause, or drastically lower tow ratings for USA models as compared to the (identical) models for European or other markets. 
I can understand people’s concerns about towing, but I've been towing most all of my adult life, from driving semi's with doubles and triples, to pulling travel trailers and boats with big "gas hog" pick up trucks. And the once a month trip to the local land fill.
To date I have in access of 500,000 miles under my belt towing trailers, they simply don't bother me in the least.
Properly set up, with trailer brakes where the trailer axle takes part of the braking load, you pretty safe as long as you’re not trying to haul a 5,000 lb trailer with a 2,500 lb car.
The trailer weight rating for the Loyale (with trailer brakes) is 1984 lbs, keep in mind, that is with brakes, without brakes, it drops down to under 1,300 lbs.
I don't intend to go over 1,300 lbs with trailer brakes. that is well below the rated capicity the car can tow.
Add to that an evenly dispersed load both in front of and behind the tow axle, with a tongue weight of about 120 lbs and you have a pretty safe towing set-up.
I don't intend to go up the mountain, or down the mountain for that matter doing warp 9, I intend to drive at a leisurely pace.
You can’t just grab a car (any car) and a trailer (any trailer) and figure that you can tow it, you have to think and plan this stuff out, you can’t pull a 30 foot fifth wheel with a Volkswagen, but you can certainly pull a small light weight utility trailer.
Over the years I’ve found that as a general rule the naysayers are most often people that haven’t tried it, and the ones that support the idea are the ones that have actually done it.
I didn’t get a Loyale to go rock climbing or speed racing, I got one so I could tow a little vacation trailer for an economical price, after pulling a 4,500 lb trailer with a Jeep Grand Cherokee that got between 6 and 10 miles to the gallon, I’m looking forward to a little economy car that will for the most part, take me to the same places the Jeep did.
So Sit back, relax, enjoy the postings; a trailer is coming …….