well they should work nicely against early pool indeed, but since this can end up in a baneling bust i guess you need good scouting or reaction to throw a building in front. But yes these wallin with 3 3x3 buildings often means terrible behind either they will block your walloff with drones and get lings into the main and stop your mining or they will trigger happy with the drone button and deny your third most likely.
Especially on antiga see the pylon at the ramp ? reaction take the gold, contain, take the next gold and have a 4 base with 2,8 base drones vs a 2 base toss.

But I always preferred a kiwikaki style wallin ^^, it needs good probe control but you can survive most aggression and punish to heavy eco play.