We asked our Dell sales guy this question years ago now, when they had been removed one year and quickly added back the next year.
They are there mostly for government builds, and other places with high security requirements. Usually the requirement is that they need to prevent any unauthorized USB devices from being plugged in. With the PS2 m&k ports they can disable the USB ports entirely in the BIOS.
I would think most wifi jamming is just deauth attacks. It is much easier to just channel hop, enumerate clients, and send them deauthentication packets.
This way you don't need a particularly powerful radio/antenna, any laptop/hacking tool with Wi-Fi is all you need. There are scripts out there that automate the whole thing, so almost no deep knowledge of wifi protocols are required.
WPA3 has protected management frames to protect against this but most IoT cameras probably don't support WPA3 yet.
Well worse than that, Oracle closed sourced ZFS, so OpenZFS was forced to become a fork, and they are no longer compatible with each other.
As for GPL the CDDL license that ZFS uses made sure that code contributions attribute copyright to the project owners, which means they can change the license as they please without having to track down contributors.
You would think with their investments in Oracle Linux and btrfs they would welcome that license change, but apparently they need excuses to keep putting money into Solaris, and their Oracle ZFS appliances instead.
Assuming you mean hot plugged devices (thumb drives and external drives) KDE mounts them under /media
If you are expecting them to auto mount, KDE distros often don't have that enabled by default. Though I think Kubuntu has that enabled by default now so maybe that has changed. Go to System Settings -> Hardware -> Removable Devices to adjust the automount settings defaults and per drive settings.
If you don't have automount enabled you probably will need to browse to them in Dolphin once to get KDE to mount the drive first.
In any KDE app you can connect with SFTP in the open file dialog. Just type sftp://user@server/path and you can browse/open/edit files the remote server. ssh keys+agent make things a lot easier here obviously.