It's for safety for sure, but also for the guest experience given other capacity restrictions. Lodges have a sharply reduced capacity per square footage and the time limits set at 30 minutes inside... but the big reason for the limitations are the lift lines. Uphill capacity has been severely restricted and to be honest, it's keep the conditions much better and given me a lot more access to untracked powder. I'm getting less runs for sure, but they are quality runs.
From my observations, the FourRunner Quad averages around 2 people per chair as singles will often be ok with doubling up. Sometimes you get a group of 3 or 4 to even it out. These are state guidelines too, not ski area ones. It's the same at all resorts, with no more than 2 singles on a Quad and 1 single on a triple, double or enclosed Gondola. The Gondola at Stowe actually averages less than 2 passengers per 8-person cabin. The uphill capacity of the Gondola is somewhere between the MRG single and a double chair this season. I still remember when it hit me that uphill capacity was at like 20% of a normal season. In front of me it often takes like 6 cabins to get 8 people up the mountain, because if you are a single you ride alone and there are a lot of singles.... when a normal season those same 6 cabins could carry 48 people in line and we would regularly do it, the lifties stuffing singles into every empty seat.
So by my estimates, the FourRunner has been running 50% normal uphill capacity and the Gondola at around 20%. That is just crazy, but the benefit is the run down is just a lot of powder. The groomers just don't get skied off like they used to, you can find corduroy late in the morning and packed powder all day long.
A recently powder morning this week had me counting the chair capacity in the photos. Despite a full coral, the seats are only 56% filled in this photo. A group of 4 really skews the numbers, those are very rare these days. But it keeps the powder around a lot longer.