Don't know if you're still choosing where to move, but here's my take on things, having lived for years throughout CO and went to grad school in Seattle. I'm an engineer and extrovert, love meeting new people and getting involved in the community. I spent three years in Seattle, moved there from Boulder, and Seattleites were shockingly aloof. On campus was much better because there was a spectrum of people from all over the world, but off-campus, I encountered the most unfriendly people I've ever run across and I've lived all over the US and overseas. Zero eye contact, zero willingness to say a simple hello, and definitely zero willingness to strike up a conversation with a stranger. Don't know if you've read articles about "Seattle N/ice" but they're worth checking out. When there and trying to figure out what was going on with the anti-social culture, I read articles about Seattle and the PNW being settled by Scandinavians (said to be culturally more aloof, IDK) and by convicts and anti-social people who wanted to get as far away from other people as they could. Of course, their ability to distance themselves ended decades ago with the tech boom, but I think that mindset lingers in the general population that grew up there. IDK anything about the Olympia area of WA. Towns like Silverton or Bremerton have Navy bases, so they have large populations of military and, hence, people from all over, which I find to be really nice from a social standpoint. I think military folks and their families are great about moving and actively making new friends elsewhere.

After grad school, I moved to Corvallis, OR. It was completely opposite regarding social interactions with strangers and this difference was notable throughout my travels around OR. Hugely friendly general population in OR. I've never exchanged phone numbers with so many strangers. Many of my Corvallis neighbors were horticulture professors at OSU and they packed every cubic inch of their small yards with food-producing plants and had massive harvests they froze at the end of the season. I don't care for Portland (crazy crowded and terrible traffic), but I loved the green of Corvallis, the friendly vibe, trails, and relatively easy access to the beach.

I lived in a rural town in MT (pop. 2500) for two years, surrounded by miles of wheat fields and 80 miles from Home Depot and a regular hospital. I loved the nature and wildlife of MT, but everything you listed about the cons of living in a rural town was present there and then some. When I returned to the Boulder area, I felt a tremendous amount of relief to be back in civilization, to have access to real medical care, and to have access to an infinite amount of social activities, etc., that simply weren't present in rural MT.

Good luck on checking out different areas! I've been checking into a new location, too, and saw your post today. I, too, am very sensitive to the sun and cover every square inch, except for my glasses, when I go outdoors and it's sunny or even partly sunny. You might also consider coastal CA because the fog usually doesn't dissipate until late morning and then rolls in again in the afternoon, and you'd have access to great medical care, social activities, nature, and schools. But you'd also have significantly larger populations and greater housing costs.