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Well, yes, extra detail certainly otherwise the texture could just be sized up and look awful. Added grainyness of the background etc need to be there.
I think this particular texture needs extra detail, it would look dull in HD without it./B]
I think there is a need. However, evidence can be slight. eg these are round lights sunk into the ceiling so it makes sense for them to have a metal border around them. There is no evidence that there is a metal border in the original texture but adding one doesn't take away from the flexibility of the texture. I would argue, however that adding those 4 "lugs" on to the metal adds detail that there is no evidence for and changes the feel of the texture - and (more importantly) the shape of the lights.
Also, there is no need for evidence, if Id had made these textures in 2012, I am almost certain they would have added more detail for reasons stated above. Just look at the Doom 3 version of this texture, it looks great.
I hear what you say about "if the textures were made today" and it makes sense. However, the textures were not made today and for the last 2 decades, people have been using them in their maps. If you change the texture too much, you may start to make it not look good in those maps where the original texture was used in ways where the appearance of it was critical. Given that one of the primary functions of a HR texture pack is to replace the texture in old maps with new compatible ones, this would seem to be ill advised.
If the texture was being made for the first time and hadn't already appeared in any maps then, fine, add details, change colours, whatever. If you are trying to make a texture as compatible as possible with older maps, then don't do that. In fact, doing just that underpins one of the most common criticisms of the existing HR packs - that they don't look like/don't have the same feel/are the wrong colour/etc/etc compared to the originals.