If they can withstand heavy winters they can also withstand heavy summers. Insulation is awesome that way. I've kept my well-insulated house cool by shutting the triple glazed windows and the blinds during the day and opening everything at night. And that wasn't just one day, it was hot (35-37C) for weeks. Although we were lucky that it wasn't hot at night, like it was in Australia.
It's not "basic technology". It's easy to find somewhere to get an email account, but you're not going to find a Lemmy instance on Facebook or in an advert or at work. And Email doesn't usually say "we don't like that instance anymore so you won't get any more messages from there, so you have to sign up to something else" (see Beehaw).
The problem is y'all are tech savvy and have no idea what it's like to not be tech savvy. Hell, my wife is a goddamn computer scientist and can't handle this stuff.
It doesn't matter what "instance" you sign up for with email, you'll get all mail. But just the email for YOU. If you pick federated on Mastodon you get half a billion messages a minute and none of them are for you.
When you pick "federated" you'll see all posts, independent from your instance. But that's pretty much impossible because unless you have Tusky the posts will be too fast.
So yeah, to be able to read anything you have to just read the posts on your instance, meaning it does matter which one you pick.
If it's very mild you can still infect someone with a worse version. When I had rubella I just had a slight rash and didn't feel sick but my brother was really sick for a week.
I really, really don't want the current Reddit where admin allows blatant adverts in posts, racism and homophobia and bans people who encourage protests.
Is going backwards "developing", though?