Yes. They're entirely different games.
18th century dungeon crawl and/or RPG deathmatching? I've seen the series, but have never played it.
This to me, seems inelegant :shrug: (but effective).
Inelegant in what sense? Pared down compared to the single player game, maybe, but that's fairly standard for multiplayer in most games and "not quite as good as the single player" or "doesn't have the same features as single player" doesn't really equate to inelegant.
A game's functions for multiplayer, are just part of it... like you mention with RDR ~they stripped down the gameplay to just the timeless encounters. (if I understand you correctly)
I can't shake the feeling that a MP enabled TES would show symptoms of it outside of the multiplayer sessions. :shrug:
They stripped it down in some places, they changed and tweaked it in others, and they added a few in some other places. Multiplayer has a leveling system that handles unlocks for weapons, characters, and mounts, for example - when you enter a multiplayer game, your level determines what weapon you start with (though you can easily just go and find a better one, either by lifting it off of an NPC, earning it by completing some sort of challenge, or killing another player and taking it from them). They didn't make changes to the single player experience to make it sit better with the multiplayer experience, they made changes to the multiplayer to change, add, or remove features that wouldn't work with the single player.
And again, I'm not sure why there would have to be any symptoms of the multiplayer within the single player experience. Issues with components of the single player being less polished than they could have been thanks to a shift of resources towards multiplayer development maybe (but again, this isn't really something I think anyone except Bethesda would really be able to say would happen with any sort of certainty), but the multiplayer component of a game actually "leaking" its design elements into the single player experience is pretty exceptionally rare in general outside of games that are built for multiplayer first (and even then, it's more an issue with lower-profile titles than anything).
And as for a game's functions for multiplayer being a part of it in general... again, I have to use Chaos Theory as an example. The multiplayer is similar from a larger design perspective - it's recognizably a Splinter Cell game, and it plays like one - but when it comes to specifics, it's a very different game - controls, movement, abilities, equipment... pretty much everything handles at least slightly differently in the multiplayer. The multiplayer component even has issues with modern graphics hardware that the single player component doesn't, since (IIRC) it's actually based on a different engine. It's literally an entirely separate game. There's a few other examples like that (Crysis is a good one - the multiplayer for that is actually standalone and is just included with the game itself), but that's a bit besides the point.
I'm not trying to make the argument here that Bethesda should add multiplayer, that it would work well, or that they can do it properly. All I'm saying is that it
could work well and it
could be done properly. Whether or not Bethesda themselves could do it is something that I think only Bethesda has enough information to decide right now.
***Are you arguing for it on principle or is it something you'd like to see implemented?
I don't especially want it, but I don't care either way if it's in or not. I just find nearly every argument against its inclusion to be pretty shaky at best, and whether or not I agree with where they're coming from doesn't change the fact that I won't stand for a poorly-founded argument.
An announcement that they're including a co-op component wouldn't influence my opinion of the game in either direction, because right now I don't think an assumption that it would
necessarily harm the rest of the game or
necessarily be bad and/or pointless has a solid basis. It might have a negative influence on the rest of the game, or it might be an extremely fun and worthwhile addition. It might do both. Maybe the two would balance out and the game would be no worse off so long as you're willing to play it with other people. Maybe they wouldn't, but the co-op would end up so good that the game would be better overall (again, assuming you're willing to play with other people). Maybe it would be handled so catastrophically poorly that the entire game would end up worse than Two Worlds as a result. My point isn't so much that I think any of these would happen as that
I don't know if any of these would happen, and I don't think anyone really has enough insight into Bethesda's resources, employees, willingness to spend on these sorts of things, or general abilities in these areas to make a judgement on whether or not they would happen, let alone talk about these things as though they're almost guaranteed.