Check out the insane goals against numbers in the NHL the year Gretsky scored 92. It's practically a different sport.
81/82
Minnesota North Stars 288
Winnipeg Jets* 332
St. Louis Blues* 349
Chicago Black Hawks 363
Toronto Maple Leafs 380
Detroit Red Wings 351
Edmonton Oilers* 295
Vancouver Canucks* 286
Calgary Flames* 345
Los Angeles Kings* 369
Colorado Rockies 362
Montreal Canadiens* 223
Boston Bruins* 285
Buffalo Sabres* 273
Quebec Nordiques* 345
Hartford Whalers 351
New York Islanders* 250
New York Rangers* 306
Philadelphia Flyers* 326
Pittsburgh Penguins* 337
Washington Capitals 338
18/19
Tampa Bay Lightning* 222
Boston Bruins* 215
Toronto Maple Leafs* 251
Montreal Canadiens 236
Florida Panthers 280
Buffalo Sabres 271
Detroit Red Wings 277
Ottawa Senators 302
Washington Capitals* 249
New York Islanders* 196
Pittsburgh Penguins* 241
Carolina Hurricanes* 223
Columbus Blue Jackets 232
Philadelphia Flyers 281
New York Rangers 272
New Jersey Devils 275
Nashville Predators* 214
Winnipeg Jets* 272
St. Louis Blues* 223
Dallas Stars* 202
Colorado Avalanche* 260
Chicago Blackhawks 292
Minnesota Wild 237
Calgary Flames* 227
San Jose Sharks* 261
Vegas Golden Knights* 230
Arizona Coyotes 223
Vancouver Canucks 254
Anaheim Ducks 251
Edmonton Oilers 274
Los Angeles Kings 263
The Canadians, Buffalo, Boston, & NYI were the only good defensive squads in the whole League in 82. It's really hard to compare the eras.
Oh, it’s a COMPLETELY different sport now to what it was back then.
It’s more than even just the total goals against.
So much of analytics is driven by puck possession numbers and puck possession wasn’t even a valued consideration back in 1982. That did not come until after the Europeans arrived.
There were a few outliers in that regard. Roger Nielsen immediately springs to mind and really, Herb Brooks does too. He wasn’t in the NHL just yet, but he was preaching puck possession at the NCAA level as far back as the mid-70s.
However, the vast majority of the hockey world looked at the sport like a bubble hockey table at that time. The right handed shots played on the right wing, while the left-handed shots played on the left wing.
When you gained the redline, if you did not have an immediate path to the goaltender, you dumped the puck into the corner and chased after it.
Also, the whole concept of playing a system at that time would have been seen as being completely ridiculous. They just played hockey and didn’t really pay any attention to any particular system.
Basically, if you were in the top six forwards you tried to score and if you were in the bottom six you tried to prevent the other team from scoring.
Just a completely different game.