Which kubuntu to install

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Which kubuntu to install
Old kubuntu's are great. New ones are full of junk, and
has less function (in my opinion, you may not agree).

Old ones have Kaffeine, Audacity, Avidemux, Gimp, Kile, Kate editors,
K3B CD-writer
or you can install them from repository.

There are panels, and I can add stuff to panels (terminal, firefox,..)
I click left bottom corner, where I can easily locate, shut-down, logout, change user, manage user, system settings,
search for anything.
..
In new ones, I'm forced to see icons which I will never use, or who knows,
I will activate chat without realizing it, and my computer will be public property, just because I don't have the last update.
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After this introduction Questions:

-Can I have new kubuntu, but old everything,
I mean old interface, old familiar programs, no junk icons, only difference will be LTS.

-What if there is no LTS. What will go wrong?
I only care about security updates.
Also wondering, who can possibly attack, just because I don;t have the last update.
Only connection I make with internet is, firefox, and ubuntu's site via sudo terminal commands.
Can any of these be a source of attack, and what kind of attack can it be. I mean,
can a site see that I'm using an old kubuntu, and they know know how to attack it, and they just do.
Is this how it works?
Or a download a .pdf, or ,mp3, and open them, will there be a risk?

-Can I get kaffeine, audacity, avidemux, firefox, kile, kate, office equivalent (to view some files)
from reliable places with or without sudo command?

-Can I freely uninstall any program without affecting the rest?

-Should I use lubuntu instead?

.................
The last kubuntu I used crashed, for unknown reasons, but it was usually slow for no reason,
and there were 50 programs running by kubuntu itself. Why would so many processes needed.
Older ones needed about 10 processes only.

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K3B is important. I'm not sure if new *ubuntu's have k3b or allow CD-writing.
I have two dead kubuntu computers which have CD writes.
One has grub error, for the other one I don't see the reason, because
its own monitor is dead, and external monitor not showing anything either, but
I suspect there are minor issues I'm not aware of.
SO ONCE I RECOVER or format those computers, I want to be able to use K3B to write to CDs.
Is there no such k3B anymore?

..........
Why are good programs being removed from repository one by one.
Hard to understand. And we are shown options, and neither works, and not sure which can be trusted.

................
ALSO WONDERING if there is a difference between old and new *ubuntu's in terms of
creating live-usb FLASH disk.
For example in old versions, I would download ISO file, and just click on it, to start burning (after choosing the target).
Can I still do it (is I choose an old version)?
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Also in previous versions, I could browse the computer, via dolphin, go to the root, and from there
choose any user, and acces its files if chmod rules are like 700.
In new versions visiting root via dolphin is not possible.
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Any difference in terms of full-disk encryption options?
Old ones would work smoothly.
New ones have lots of bugs (in my opinion):
-asking more than one pw, not clear which one is for encryption, and they just call it things like security key.
-forcing to connect internet during installation: why, it is like giving a new born baby to a stranger for protection.
(windows doing this and a lot more, but linux shouldn't do such things)
-new ones don't say full disk encryption; uses different words, become confusing, and after installation, 99 percent not encrypted.

I suspect, old ones are more secure, because in new ones we don't know what to do, we will easily be misled to do wrong things,
and have false sense of security.


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Thanks for partial answers in advance.

You won't like some comments, you can consider them as feedback.
Not everyone is happier with newer things.
Also "new" things are often required, and old ones just don't work.
For example browsers may not open sites, or "antispam" bots may block access, because
we refuse to surrender something, by using an old computer.
"security"means, for them, securing their access to our stuff.
This is ubuntu's own site .. if it was a third party site, it could be more useful in some ways
(but worse in some ways, everyone would push their own app or plugin or .exe program)