Alistair's story is the same, because the mod isn't canon. You can't use non canon to prove a point.
And I never meant just romance depth but character depth. I keep using Varric as an example, because he's the only DA:I companion that we know quite a lot about. If Varric stays true to his races belief that they are better than the other races and only romances other Dwarves, it adds more to what his character is than if he just starts sleeping around with every race with no other reason than playersex.
I don't think you even understand my point.
You said that restricted romances have more depth than accessible ones. By your logic, a mod that makes Alistair's romance accessible to male characters would therefore cause said romance to lose depth that it had previously. The canonicity of said mod is completely irrelevent to the point, and your insistence on harping on about that particular detail makes me think you either don't understand my argument, or you are just stalling for time.
If you had paid any attention to Varric in DA2, you would know that he doesn't, in fact, stay true to the 'beliefs' of his 'race'. He is actually a very non-traditionalist dwarf who hates living underground, and doesn't worship the Paragons.
So far, the only thing preventing him from being in a romance with anybody at all is the fact that he still pines for Bianca. There is little to no information about what he might be attracted to if she was out of the picture.