This whole argument is stupid. The halfpipe is the halfpipe. There is a noticeable difference between what the women and men are doing, but so what? The women are judged against their peers just like the men are. If there is an issue of mass, so be it - they'll overcome it. You don't change the sport, you expect them to progress and figure it out. That's what Chloe Kim is doing. She's raising the bar and doing things we haven't seen before. The pipe has grown over the years because the sport is progressing. If you look at it from a progression standpoint, men have had a longer run at this since, like so many other sports, it was first marketed primarily to young men. So the men got to ease into the larger structures over time - smaller steps to progress. The women didn't have that opportunity since they weren't really invited to the party until later. And yet you still have competitors like this perpetually smiling 17 year old who throws down crazy tricks and raises the stakes for everyone else. The women don't need smaller halfpipes. They just need to keep doing the same thing the guys are doing - progressing their sport from where it is now to where they want it to go.
And BTW, if there were an argument to be made about the effect of lesser mass on performance, it'd probably be better made on the luge track. Sliding down a frictionless surface at 80+ mph is one place that being bigger can help give at least a little more control. And yet, even after a horrific crash for Emily Sweeney and a recognition that shit can literally go sideways for them a lot easier than it did for the men, you don't see anyone of the competitors saying they should be given an easier course. Because they're athletes. This is what they do.