Hey, what's wrong with that logic?
(My early apologies, I'm a Doom junkie. My PC gaming, hardware, and programming experience began with Doom 2. I don't think you really asked for all this, but I'm going to give it to you.
)
If I'm not mistaken, you could run "doom2 -wad plutonia.wad" and it would work fine, without the proper narrative though. You'd need a dehacked patch for that as it was part of the exe. (Please tell me I'm not the only one here who used dehacked...
)
However, you couldn't use "doom2 -wad doom.wad" or "doom -wad doom2.wad" as they were completely different. I did provide a
link to explain this: "Final DOOM is an official addon that adds two new episodes to DOOM II." Also from
id's own site: "Two New, 32-Level DOOM II Episodes."
Final Doom was mostly developed outside of id anyway by TeamTNT. The
Final Doom Wikipedia article lists
TeamTNT's website, which contains this quote of further clarification: "Final DOOM...contains two new 32-level replacement WADs for DOOM2, and an updated executable to allow full text replacements for the level names in the maps and the intermission texts." Looks like I was correct with the dehacked non-sense.
Seriously, Doom 3 isn't even Doom 3. It's Doom all over again, as you seem to have said. But you know how good id is with game names as Quake 1-3 had absolutely nothing to do with one another. And Quake 4, the only real sequel since Doom 2, was developed out of house by Raven.
As another interesting bit of trivia, if you ever used Doom Legacy (a popular source port for the doom engine), it was originally named doom3.exe and installed in the Doom3 directory by default. I had a problem when installing id's Doom 3 as C:\Games\Doom3 was already taken.