Ability to inspect other player's skills and tripods

How do I know if they aren’t running a completely troll build? I just had a lava chromanium fight on my alt where it took nearly 6 minutes to just break his shell, we had a paladin with us, so my assumption is he didn’t take executioners sword with weak point tripod at the least. Chances are the other classes didn’t take much weakpoint, if any at all. The skills and tripods you use are half of your viability from my POV and engravings, stats,gems are only half the equation. Imagine if a paladin didn’t take wrath of god and heavenly blessings with attk power tripod buffs. They would be utterly useless, but you have no idea before inviting him and wasting your time in raid.