You're right and very assertive on your observations. In Chile fliers are not encouraged to go off-runway as there are plenty of runways, but to be fair, it was only this year that local aviation authority (Dgac) lifted restrictions on that, so it is quite flourishing and there's a large community of Huskys growing. Floatplane wise my plane and a friend's are the only two high wing floatplanes in the entire country, plus a couple of Lakers and that's it, though there are some ultralights... backcountry pilots here are low profile and almost hard to find, but we all know who they are and how to reach them, I don't think you will find them even at that large gathering in Villarica's flying club. You are right about weather south of Puerto Montt and LL availability. That makes flying there sometimes barely legal regarding weather and weight margins (ferry fuel), thus not exposing themselves unnecessarily with pictures at all. When you know people, you always have where to leave some gas barrels though.
Anyway we have lots of beatiful lakes and remote areas in or nearby the Andes (low Andes there) north of Puerto Montt to start, and a bit to the south there's still good reach, google Parque Pumalin for instance, it was founded by Douglas Tompkins (rest in peace) and was now donned to the Chilean Government along Patagonia National Park (PNP) by Douglas wife Christine.
Lots of runways, lots of pristine scenery, lots of tourists all year round, lots of back country flying opportunities. Yeah we could use some more infrastructure, but other than that it looks a lot like Pacific Northwest and New Zealand, and yes, near Punta Arenas it is tundra country, like Alaska, wind wise too.
Again feel free to contact anytime if you want to come around or just know a bit more. Personally I'm looking forward to visiting PNW next year and have some flying around those islands.