I understand your question well. Here is the way a typical boat dive goes. You are visiting an area, anywhere USA or some exotic locale. You go to the dive shop and ask about diving and they tell you it is great and they have a boat going out in the morning. You sign up and give a deposit. Sure enough, next morning a boat is at the dock as promised and is rapidly filling with divers, most are excited and talking and chattering, a few are quiet and reserved sipping some coffee, others are knocking stuff over, fins and masks are everywhere, the National Geographic wannabee photo guy is hogging all the deck space with his camera gear and complaining people are stepping on it so I help him out and step on it some more. Then you got the guys with the big spear guns and the captain is arguing with them about no spearing allowed. Somehow you get your gear on the boat and yourself and the lines are cast off and veroooooooom, away you go. You are alone, you look around, soon the captain ask for buddy teams, you ask to dive solo and they freakout and quote the stupid PadI Bible to you and claim gravity will cease if they allow solo diving and they team you or you team with some guy you have never seen. It is a two tank dive and two different locations. there is current and once anchored you must descend and go down the anchor line. You don't get to say "Hold Everyhting" into your Dick Tracy watch and go dive a quarry with your new buddy. Amongst all the chatter and chaos and drum of the diesels and the camera guy fussing with the spear guys and the lady changing cloths in the front of the boat and the guy changing his cloths in the back of the boat and you figure they are an excellent match and the three divers vomiting off the side you figure you are on a ride to Hell.
So what do you do, do you not dive? Do you dive and if the buddy is a dweeb do you dump him and take the wrath of the captian when you return or do you just decide to babysit the dweeb or do you luck out and get a good buddy or what--it is pretty much wild card. What if you ask to dive with the "squared away guy" and he and his "squared away" buddy say no because they only dive with a "squared away" "team". This is the real world of tourist diving. There is no get to know, there is only go or no. N