Well, come on, it's a television show. Trip should be in a vegetative state after all the concussions he's had. Archer should no longer be able to function from the PTSD from all HIS various captivities and tortures and so on. It's pretty typical for the lead characters in an action adventure series. (Mulder and Scully both belonged in a nuthouse by less than halfway through theirs.) I would agree that T'Pol's traumas tended to be a bit more, ahem, intrusive, but at least they had a science fiction element and were a break from all the beatings and shootings and near-hangings and such.
If drama or fanfic were realistic, these guys would be spending 95% of their lives sleeping, running drills, doing maintenance, making detailed scans, and generally boring us silly.
I've pretty much ranted enough about Archer-bashing, so I think I'll leave that one alone. I can't take another festival of

I will say that if your focus is exclusively TnT, you miss some very nice fic out there. I almost didn't read "The Last Request" that's up at fanfic.net because it showed up as Archer/T'Pol, but that would have been a real shame. It was lovely. And you really should read Bluedana fics even though they're focused on Archer -- she's just wonderful, and very TnT-friendly.