That's because people don't think about unintended consequences. People already complain about pressure to skip cutscenes. It will get far, far worse if you suddenly have the option to do all those things solo. People who want to do it in a group will be told to go do it solo so they don't waste people's time on cutscenes.
The mere presence of such an option will change the game and the community.
The budget required to do this would take away from something else... so yes, there is a cost to people who don't want it. Not to mention this is not a single player game. Demands to make everything soloable effectively turn it into a single player game until suddenly at endgame it's not, which will then lead to "biat and switch" complaints about how much the game changes at the end and requests to make the endgame soloable too.I would have liked that too as with a slow internet connection, dungeons are very difficult towards the end of the story line with all the AOE by the ton. And what is harming you personally? Nothing. You could still continue to play just like you always have. Options are just that, options. MMO Massive Multiplayer Online..nowhere does it say MMOMAG (Massive Multiplayer Online Must Always Group) Give people options. Don't like it? Don't do it that way. It was brought up as a request for options, not a demand to change the whole game.
Sorry, but at some point if you don't like what the game is, it might be time to play something else instead of trying to change the genre it's in entirely.
And the people who play with someone all the time are supposed to do... what, exactly? There's already too much mandatory solo content in the game. More of it is the absolute last thing the game needs.
At some point, people who want a single player game should go play a single player game. There's quite a lot of excellent ones on the market. Changing multiplayer games into single player games is taking a multiplayer game away from people who want that.