Eh don't worry, it's merely a choice. You can choose to use a bunch of different skins for some of the characters and there is also a HD version of regular Alyx.

I am probably not the target audience for this mod since I don't really care about graphics from a technical standpoint (ie I prefer great design and coherence even with low tech to random high quality texture/effects) but yeah I don't see the point of this mod. Half Life 2 does not need a graphical revamp.