There are two answers to your questions I guess...
THEORY
In theory full housing is the correct technical choice. When you stop the housing at the top of the head tube (either in the stem or with a cable stop) you might encounter brake/front-wheel shudder which was a very important topic in cyclo-cross back in the cantilever brakes days.
https://i.stack.imgur.com/YvAMo.png If you are braking and the distance from the cable stop (in that case in the stem) and the cable attachment reduces (imagine pulling the stem down or the top of the steerer forward) or if the braking force pulls your fork back and thus increases cable tension then you are in an unstable situation.
In Cyclocross it was solved by moving the cable housing stop under the head tube :
https://i.stack.imgur.com/dR4YY.jpg[/url]
PRACTICE
I’ve ran a Tririg Alpha One both ways and haven’t encoutered a situation with a weird endeavour, maybe I’ve not been in a situation front braking hard enough in a bumpy downhill for the theory to become an actual issue, maybe I’m not heavy enough, maybe everything is stiff enough on my TT bike with no spacer under the Alpha One stem for this to be an issue. So probably a bit of everything playing in my favor.
So I don’t think saying it’s the same is actually true, saying full housing is actually more sound mechanically but for most you should be fine with bare cable is probably more correct. And if you decide to run bare cable and find there is an issue it’s an easy « fix » ;-)