Hello,
I really like KDE. I think it is one of the best desktops. The thing that is the best is the customization directly in the settings panel without the need to go elsewhere and futz around. Nice. I liked the deepin theme with rounded windows and big shadows. That is easy to do.
I had fun with kubuntu and then tried KDE Neon.

I eventually went back to Ubuntu after 7 or so years of various platforms, mostly Mate and eOS.
There were some issues.

Wifi never worked well in any kde flavor.
If the wifi was not already on, then kde could not connect. This is not useful for those who don't have dedicated wifi but rely on wifi.
aka a phone hotspot or portable wifi router. I had to often turn on the wifi hotspot on my phone, and then reboot.

Ubuntu has nice VPN Blootooth Wifi toggles. This always works and is easy to see.
Kde is not easy to work with and ui is too small or subtle.

Kde Wallet is not compatible with keyring apps. This is a big problem for vscode.

No integration with google accounts like gnome and ubuntu
i like geary.


KDE Neon crash (last month)
The main issue was, updates in neon They scared the hell out of me when i would get update message (kde is updating) happening before boot (just like win10).
Eventually after an update and installing a calculator (Kalculator or kalc?) ..My machine crashed and it was not recoverable.

Kubuntu crash: (about 6 moths ago)
I had kubuntu crash too. It seems that the kde partition manager is not the same as gparted. Gparted can easily move a parition that has an operating system on it. Kparted had some problems. I'm not sure if kubuntu shuts down or hibernates or something, but i had a crash there.

Summary:
These were some of my show stoppers for keeping kde. I need wifi connections to run smoothly and I cannot have my computer crashing. Sorry. I hope the kde team keeps working. It is a great interface and uses less computing power.

I'm not part of the KDE team.

I do remember that when I had Kubuntu 18.04, that when I disable the Wifi card to make sure it would use the RJ45, on the next reboot, it would renable the Wifi. This was a desktop. I guess Kubuntu doesn't save the state.
I run Kubuntu 20.10 on another PC with no Wifi. So, I can't comment.

You should also discuss such bugs with people at Kubuntu. KDE is just the environment and Canonical takes the KDE source code and customizes and compiles it.

Moving partitions around. I've never done it even when I was a 100% Windows user. It is just too risky.

An update to kCalc should not disable your OS.
I'm a noobie as well. I've been using Kubuntu for 1.5 y. I damaged Kubuntu badly once. I used another PC to search the web. I booted into the terminal and with some sudo apt-get commands, I was able to restore.
However, I do understand that it can be frustrating when an update damages the system.