Going to bite here. It depends on how you view content. TOR had lots and lots and lots of single player stuff. Absolutely no question about that. But the -vast- majority of actual content was the group-required dungeons and operations (raids) comparatively, as well as all the group-suggested quests (which were quite a bit in each area).
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Perhaps i should have clarified not only END game content. TOR was not primarily group based content ( pvp does not count ) at least through alderaan/tatooine which is where i got bored... Spent most of my time alone other than the 30 minitue McDungeons they had along the way ( the one on the space station for both sides was cool however, nice hook )
What I was getting at in my rather long-winded post, is that most games actually do have a focus on group content. The thing is that it isn't -all- group content, which appears to be many folks' gripe here. Instead of being forced to group, it is strongly suggested that you group (for literally everything) in the game. There are still the shitty holdouts that have single spawn items that are needed by everyone in the group, just as there were in EQ. But the fastest and best way to progress in every game is always grouping up. Especially doing dungeons and group-specific content.
I get what you are saying, in that "which game has come out that caters specifically to the grouping required crowd" is your actual question. The issue being, that in every game ever, there simply aren't a 1-4 ratio (or whatever your group size is) of healers/tanks to everyone else, so that if everyone in your game logs on at once, there are a lot of people who simply cannot complete content in those types of games due to class disparity. Which is why every game since has gone the route of having solo content available in tandem with group content.
It doesn't have to be a binary situation of group content or not. And in every game since EQ, it isn't.