I don't have any experience with it but this might do something along those lines(?):

https://esphome.io/components/binary_sensor/ble_presence.html

Seems like you can just add it to one or more of your existing esphome devices.

Not a monetary one, no.

* (there might exist some business power tariffs that coincidentally benefit from this but nothing you'd use at home)

I started out with WireGuard. As you said its a little finicky to get the config to work but after that it was great.

As long as it was just my devices this was fine and simple but as soon as you expand this service to family members or friends (including not-so-technical people) it gets too annoying to manually deal with the configs.

And that's where Tailscale / Headscale comes in to save the day because now your workload as the admin is reduced to pointing their apps to the right server and having them enter their username and password.

Apart from the visibility argument. With this kind of parking spot you have to leave the spot in the other direction than you came in. So you'll only get the enhanced agility for one of the moves.

Would you rather have more agility when getting into the tight parking spot or when leaving onto a larger street?

You asked for a way to block communities from other instances.

Now you can go through all communities on all federated instances and block them one by one. I'll surely be impressed by your endurance if you manage to do that.

The "add to home screen" button turns into an "install" button when Firefox detects that the website is a progressive web app (PWA). Other browsers do the same.

The difference is that a PWA can define a custom icon and name for the "app" button on your home screen and that it can use some clever caching making many PWAs offline capable (meaning you don't need an internet connection to open the web page).

I understand the reluctance to press "install" but in the case of PWAs the install size is tiny and fully contained in Firefox and you get the added benefit of faster startup / loading times due to caching.

I changed out the battery but other than that it's still going strong. More than powerful enough for my workloads (mainly browsing and videos).The OLED screen is still in perfect condition.

Doesn't support 5G and some GNSS providers if that's something you care about. But at some point I'll be forced to upgrade because its not going to get anything newer than Android 11.