If something is designed for one person, allowing more than one person to do it would trivialize it. You can't complete them in a party because they would be too easy. The further you progress, the more the game opens up and the more you can do in a group.

As much as I love the game so far, these various issues are starting to add up into a huge problem for us.
It's not an issue, and your vague statement is a fallacy. Also, don't use the word 'us' when the problem is based on your opinion rather than that of everyone around you.