Why is switching from Windows to Linux Desktop so hard?

I have been always using Microsoft Windows as my Desktop OS, and I would consider myself a super user since my apprenticeship as a system administrator.
I have always tried stuff with Linux and raspberry pi, started digging into Linux after my apprenticeship. Mostly server stuff.
The last two years I got into FreeBSD, running on servers.
So I thought to myself, why not switching to a Linux desktop (FreeBSD desktop would have been a little bit too hard I thought).
The decision was motivated mostly because of the cloud and AI stuff Microsoft is pushing everything into.

I prepared everything, moved personal files from my PC to my small FreeBSD server on a Samba share.
Exported the most relevant files etc, almost like deleting everything.
But I went with dual boot, Linux Mint Xfce on a secondary drive.
Installation went smooth, then I encountered the first disappointment: Nextcloud Desktop (self hosted, stores files I need on PC, Laptop, Phone as well as contacts and calender) does not support cloud files. So I had to pick what I wanted to sync.
Whatever.
Second small Issue, there is no YubiKey Manager for Linux (as far as I have been looking).
Fortunately YubiKey Authenticator works.

I continued my journey switching to software I have not used before.
This evening I wanted to do something that would have taken me 20 Minutes on my old setup. I have not been able to complete it after a few hours.
The issue is:
OpenVPN Setup only connects using the console, not via network manager, so good so far.
The RDP File won't work with remmina RDP client because some sort of authentication via remote Gateway which works on Windows out of the box.
I couldn't figure out why.

Now I am disappointed.
This should be easier for someone like me, with technical knowledge and error solving soft skills.

I will probably need to go back to Windows, because I am used to it and also because of solutions someone in corporate IT is building, that only support Windows.

Two things probably would have required me to use Windows nevertheless:
- gaming, which I am not doing often
- adobe Lightroom, because it is just so easy to use.

Sorry to disappoint y'all. I don't like it either.

Have a good night.