Tbh I'm not even sure what's the strength of crossbow, other than elemental gimmick, which usually worse than psi, if the character is hybrid.
"stealth sniping" isn't reliable due to how stealth kill works in this game. 3 people around, killed 2, survivor yelled, everyone ganked on you anyway.
Deadly Snare is nice, but you usually has to invest on some crit chance on the side (unless you're so adamant on laying bear trap everywhere pre-combat), and on ranged case, you could stack up really high crit chance from weapon mod and goggles
Pure crossbow can't deal with tin cans without resorting to traps / grenade / poison spam (which usually negated by their DT, too).
They do have huge amount of crit damage, but compared with a sniper, their actual damage is far worse. I think even laser pistol could dish out better spike damage