Why are people calling the NM train "parasitic"?

[Nestama]

I had at least 3 Pazuzu kills before I was even 19. You may be right but it doesn't hurt to get experience with the boss mechanics earlier. Though at the same time, as someone else posted, you can miss a ton of nms by not being with the train.

Which unfortunately only happens because people instantly attack the NM the second it appears, rather than wait for people to show up. I'm still disappointed at the SMN who instantly attacked the wind NM I spawned alone.
That said, the only NM's I really care about not wanting to miss (now that I'm level 20) are those that are level 10+. Anything below I can deal with missing. Especially Sabotender Corrido. Really don't care if I miss that one.

Personally, I still think it would be best for low level players to focus on spawning/fighting the low level NM's on their own. If a high level player complains about missing Sabotender Corrido, then they need to get off their high horse (especially if they can use a mount).