I think shell never have a spot in pro league or high level full squads, any trap operator is at a disadvantage with a co ordinated team.
At mid/low level the issue is so many use her traps in the most obvious places, like the windows and doors into objective. I use Kapkhan a lot and I use his traps like a roaming lesion. I use them to cover my flanks and use them on common entrances to push an objective. For instance on coastline penthouse, Ill put one on hookah lounge into the hallway. Ill put 1/2 on objective doors for those last second pushes where they forget.
Frost can get really creative and have more success. I laughed last night when I was pushing lockers on bank through the garage with glaz. I drones in to garage, all clear so push to the white van at the far side and ADS strafing around the back side to see into the objective door, she frost trap behind the van and I stepped into it lol. I clapped after that for myself, brilliant.
Only one better Ive seen is same map where she put a frost trap on both sides of the car under the garage door you push in from outside. Two teammates simultaneously hit them pushing into garage. Brilliant.