Edit: Lmao I didn’t even think about Find Party 
As title says, I often find myself in a team with 2-3 supports (myself included), which makes the already difficult game, more difficult.
Aside from the berserk mechanic of bosses, which can be reached with low dps, the dungeons are still hard even with a shielding team, so most of the times it will inevitably lead to a 2 hour grind for a single boss.
I would much prefer to spend a minute of matchmaking that leads to a well-balanced team.
I agree with this. I was just running the item lvl580 boss and even with two players item lvl950+ we still lost, but I also feel we lost because no one knew the mechanics well enough to dodge the big moves, this could have been easily avoided if the game developers provide us with tutorial or at least some type of explanation on the boss’ fighting mechanics… As a result, people keep wasting time Matchmaking hoping to get carried by super higher level players (for example, item lvl1500+) or else we keep dying and dying, it’s max 20min each boss run, I feel I could have used my time much better lol
Why dont u use the Find Party tool then? Usually takes about 2-3 Minutes to fill a group but atleast u get to choose which classes to play with.