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Some games have a complicated enough Anti-Cheat that it'd be an absolute pain to get it working with Linux. Honestly, it's not worth it to gain 3% more players. I'd recommend just running a Windows VM in Linux.
Some won't even run in vm
I've spent quite some time setting up KVM with GPU passthrough and modifying qemu and my kernel as to circumvent VM detection of anti cheat software. While it worked in principle, overhead from virtualization and reduced core count meant that some resource-heavy games ran extremely poorly (while they would have run just fine without virtualization).
Running a VM would imply dealing with VFIO. For a recently converted casual Linux gamer it's better for them to dual boot than deal with that headache.
I didn't fully transition to Linux until I simply decided I needed to (thanks, Windows 10!) and committed. Using Windows as a crutch removes a lot of incentive to learn how to get it all running under Linux.
I get your point in dual boot being less of a headache, but learning some libvirt/qemu and running your own virtual machines is a lot of fun.
I went for a virtual Fedora Workstation with VFIO and a dummy plug. Then I use Sunshine/Moonlight to stream my gaming session to whichever device I feel like using.Anytime I wanna try something I feel might crash my Fedora I simply backup the virtual machine files and go to town on it.
If I fail I roll back and try again.
I run my servers the same way, as virtual machines that I can easily backup and experiment with, and I do think it makes learning a lot quicker.It is, I'm not knocking out the usefulness of the tech. I'm thinking more about how convenient it is for the average gamer vs. dual booting
I mean Leagur of Legends works fine on Linux and I never had issues with obvious cheaters. If Riot Games can get it done, then so can everbody else.
(I feel the need to state that ingame runs fine, the client is the worst piece of software I have ever had to run on my machine)