Yes

Many ways to install it officially nowadays (see their website) but most do it via docker. A very easy albeit unoffical way is via flatpak.

She should be fine, but yes on newer kindles like the Scribe (came out in 2022 so not exactly brand-new now) they removed the “mass storage mode” (= what made kindles show up on a pc as a usb drive).

Calibre can work with the newer MTP mode (which is similar to what android phones have) but it’s a lot less reliable and requires that no other app, including the OS, file manager, is accessing the device at the same time. It’s frustrating and I’m very happy to have jailbroken it, now I can use SFTP to browse the folders much more speedily.

Installing Koreader which can do a million things, but also playing around with terminal access, python, bash scripting, neofetch, usb-network, SSH. For older kindles: the screensaver hack was my first reason to ever jailbreak one.

Depending on the laptop (or with any laptop + smart plug) you can set charging thresholds, both for starting and stopping the charge (lower and upper limits), this way it will do a few cycles instead of staying fixed to a certain level of charge.

In order the worst things we can do to batteries are: leave them at 0% for years, leave them at 100% for years, leave them halfway for years (what happens when left plugged in with only an upper charge limit like 80%) - batteries need to do a few partial cycles at least, once in a while.

Well put, that’s the most commonly experienced anti-feature introduced, another less common one where they have been less and less lenient over the years is geolocation restrictions: people in the past could register with other countries (cheaper) pricing, today most legitimate customers cannot access their content even when traveling for a few days, or they risk getting blocked. Similarly to the region-codes on dvds and blurays, I can’t imagine it really helps sales, but it siloes consumers into country blocks and monopolies tend to like that.

I recently added a used mini pc to my lab and it has a Ryzen 3550H, 16GB ram and 512GB nvme; it cost less than 100€ total, hits almost 8000 passmark. Just to give you an idea of what you can get on the used market, I wouldn’t buy a new Celeron pc myself.