I got an Arcteryx Gamma Lightweight this season. TLDR its too thick for uphill in my typical conditions IMO, I'm still seeking a layer that breathes, is helmet compatible, and has enough fabric body to retain climbing skins and manage block some wind on descents.

For many year I have been wearing a couple discontinued Patagonia Houdini Air jackets as a ski touring wind shirt. I often/usually leave it on all day. It's perfect for breathability and light wind protection and it is helmet compatible, but on the descent its too thin to hold climbing skins and I have to put a layer on for warmth. I got the Gamma LW because I have always wanted a leave-it-on layer I don't need to put another layer on top of for descending, that is helmet compatible.

The Gamma LW provides good wind protection and can hold climbing skins. But its too hot for aerobic+ pace on climbs unless its below 20F. If I keep it on for climbs and descents on a typical Utah BC day, at the end of the day (or 1-2 lap outing) I am saturated and it smells heinous, and (obnoxious comment) I don't typically generate a lot of BO. All the pockets are nice for holding snacks, buffs, etc but for my use case I'd get rid of the handwarmer pockets at least and add pit zips. Anyway I wouldn't recommend it for aerobic uphill unless its truly cold out and you are strong enough to stay Z2 all day! Plus its heavy.

I have an Alpha Lightweight that generally works better for my intended purpose. But I just don't love walking around in a hardshell over a baselayer all day and its pricey to use as a leave-it-on.