I prefer the slack twine, myself, as it is not going to bounce back out in to the crease, as happens so many times today. The slack also traps the puck at the back of the net, at the bottom, when the puck falls down to ice level.
Most of the old timers that I play with don't like the plastic boards either, as they are either too dead or too lively, and not consistent in their "bounce " factor. One of the outdoor city park rinks here in Toronto has great wooden boards, that are at least 30 years old now. It is put up in November and comes down at the end of March, and it is old style with no modern crap. No zamboni, we clear the ice ourselves, and the lights go off at 11 pm, so we play under the moon some nights. Joe from the city parks department floods it every morning at 8 am, ands again at 5 pm, every day. .
No change rooms, just park benches in the snow, and a unheated washroom building if you need to pee. I can walk there from my house, and we play 4 a side, to 20 goals. None of the group is under 50 years old, and I play on a pair of 1966 CCM tackaberry originals, that are on their 5th set of blades. No slap shots and no raisers, so we can play in sweats and gloves, shin pads and a jock, with no problems. And no helmets either. We are all old enough to remember when no hockey player worth his salt would be caught dead wearing a helmet, including goalies.
The kids are amazed that we still use straight blade wood sticks and can shoot goals from the other blue line, or score while skating backwards away from the net. Our regular two goalies are kids of 54 and 51 years old.
I'm 62 so I can say that.
Jim b. Toronto.