3catcircus
Adventurer
It's exactly the fact that your player pointed out the discrepancy that may be of concern to some. For others (like me), I don't have the time to do the conversions myself. I want to be able to, for example, select an old edition module and not have to do the conversion for monsters that had stats in older editions but not the current edition.So much this! Especially if we're talking about GH, or Dragonlance, or the Known World/Mystara.
But why is this a problem?
When I wanted to run an Alien scenario in my Traveller game I statted up an alien using the available system resources. It took me 10 to 15 minutes. Having done it once, I statted up a larval state alien at the table in less than five. What does it matter that, at another table, or even at my table at a different time if I were in a different mood, it would be done differently?
When I posted my thread, another poster informed me that there had been stats for the various life stages of an alien published in an early number of the Journal of the Travellers' Aid Society. Having subsequently looked at those ones, they're different from (more vicious than) mine. Once I'd acquired the PDF from DriveThru RPG it was interesting to make the comparison, but that has no effect on the (successful) play experience at my table.
I'm not necessarily talking about basic NPCs, but unique monsters from iconic (or not so iconic) products. For example the Abomination of Diirinka in the 2e module Axe of the Dwarvish Lords. How would you convert it?