I'm in the process of switching and now writing this from the other side

Do
you have a reason to switch? I did.
It's becoming very viable to run Linux for even gaming machines, either to avoid the Microsoft ecosystem or just because you like open source software.
I'm not trying to avoid the ecosystem as in software, I'm trying to avoid Windows as in Microsoft and Windows 10. I disagree with involuntary telemetry on all levels and want to be in control of my machine (whereas Microsoft wants to own everybody). These are enough reasons for me to switch. On the bonus side: Linux-centered software better suits me. I also do not want to contribute to the Microsoft ecosystem (as in ecosystem) anymore
I'm running in dual-boot: old Windows, fresh Windows, Linux. Obviously a lot is different than on Windows, that's the price. In terms of spent time: if you can google, you'll manage. Probably better than on Windows because you'll actually find a solution most of the time and won't land on spammy websites. My old Windows install too was tweaked and configured to my liking, I'd say it's time spent on either system. I would describe multi-DPI support as 'worse' - but this is my opinion of how it should've been made and why it will never be properly done here either. I don't care about VRR. Low latency takes
v. blood tearing as a sacrifice.
For a regular user, there're practically zero differences. Browser works - covers 90% of stuff, LibreOffice works - 92%, audio player/VLC etc - 95%.
Games/Programs - depends on what you do.
My programs will run even better, that's another reason I'm switching. Less games is better, but my top favorites all work. Warcraft 3 TFT used to be flawless, now Reforged's main menu is causing major problems with drivers/libraries... remains to be seen. On a funny note: except for this bug, I do get better in-game performance here than on Windows, and on Windows I can either choose FPS or crashing on one of the maps I play!
I'm also unencumbered by Nvidia driver problems. Like company, like relationship to Linux. Choosing not to buy Nvidia was a deliberate choice nearly 3 years ago. The only annoying problem in general is the configuration software that's missing, like for mouse macros/buttons or overclocking. Dual booting is inevitable.
Again I want to stress that if you've spent time adapting Windows to your needs, the same will be true for Linux, the process will just be different. But there're more opportunities to increase productivity and this begins with the desktop environment and window management. Dragging windows is so 1973.
The likely reason Valve is going with Linux for their steam deck is to help keep per unit cost down. If they used Windows 10/11 then there would be a $/£ 50+ added to the retail price due to the required licence, and if not then other compromises would need to be made such as paid advert deals like default browsers.
That's not their primary reason. They don't want their business to depend on Microsoft, Epic Games was very vocal about this too. And I must say I find Epic's fight against Apple and Google lovely, the only smartphone space duopolists. They can afford it too now! They're investing in their long-term future and possibly making space for their own mobile store. More power to them in this case.