I’m not like a strategy theologian or whatever but without a rule around two line pass I don’t really see how you can run the trap like the devils used to. The trapezoid makes it harder too since you can’t have your goalie retrieve dump-ins anymore
Yes and no. The trap wasn't complicated, it was essentially having 1 forechecker go in and pressure the puck with essentially the other 4 guys in the neutral zone, or at least very high up in the offensive zone. The forechecker's job wasn't so much to disrupted the play/force a turnover, or to try to generate offense, it was to funnel the puck up on side of the ice or the other where the 2nd forward would be waiting and make it difficult for a pass or skater to get through.
Allowing a two line pass might allow some ability to stretch that out, but would still have to get that pass through 4 -5 players in the neutral zone, which would be difficult. The trap clogged the neutral zone by having 4-5 guys in it.
The "trapezoid" rule probably would help the trap more than hurt it. Goalies being able to handle the puck more would allow almost a 6th skater in terms of moving the puck up the ice before the players could execute the trap. Limiting where a goalie can play the puck would help the trap IMO.
The Canes don't do this at all though. They almost always have 2-3 forecheckers in and their D doesn't hang back at all. They play the puck aggressively at the offensive blue line making it hard to get the puck out. The forwards work hard to get back and support a pinching D and dog the puck. The D play very tight gaps in the neutral zone and are good skaters with active sticks, thus making it hard to generate chances.
It's also why when the Canes aren't on their game or someone make a mistake, they can give up more odd man rushes and high quality chances. With D playing that aggressively, a mistake can lead to a 2-1.