If you read any of his other posts before in other threads, you would have got your answer.
The abridged version is that he liked the 5 man dungeon type of design, wanted to continue playing it with 5 man (perhaps because he went out of his way to make extra friends,) and now the future content will not bring the same thrill 5 man raids could provide. He’s not buying into the 3 man dynamic when everything else in this game was designed for 5 man.
I personally love the option of 5 man missions, and yet somehow GBX believes that the majority want 3 man. I definitely didn’t have a chance to offer my opinion, I would never suggest something that ludicrous. The only reason I played 3 man missions as often as I did wasn’t because I enjoyed it, but it was because the matchmaking kept forming 3 man parties after queuing for many minutes. I always wanted to play with a minimum of 4, but had to settle for 3 (I quit 2 man raids immediately without question) when I didn’t want to wait in queue any longer than I already have.
If 30 minute missions feel like a slog, it’s because the pacing, rewards, and lack of boss mix ups were hindering the experience. You don’t just take out the 5 man feature and reduce mission length as a justification. It looks like corners were cut and the real issues weren’t properly addressed.
This is another low population problem screwing the experience.