They aren't that wild or that many because the Devs got sick of the debate about having pop culture easter eggs (special random encounters) as seen in FO2. Only one dev fought to have wild wasteland. I forget which one.
There were a few pop culture (not moddern, at least not that I noticed,)
however, by random encounters I meant things like people fighting a weakened deathclaw, or a pack of dogs around a corpse carrying a key and a note to a free form quest, or a sick guy asking for water. Just to name a few from FO3. I don't mean that I want those one in NV as well but I was just pointing out the difference between WW events and random encounters.
And there are a few things in NV that would work as a random encounter, like the two I mentioned in my OP, only they would have to happen at a random* location so that they didn't happen at the same place at the same time.
*(For those who don't know, in FO3 the random events happened randomly at predesignated locations.)