First of all welcome to the forum! 
Well, dualbooting is not hard actually and it works if done right. However, there are issues such as Windows overwriting Garudas bootloader which needs some manual intervention if it happens (namely chrooting into Garuda & reinstalling the bootloader). Therefore we don’t provide support for dualboot scenarios as it will definitely cause a lot of forum threads if the person who is dualbooting isn’t prepared for it.
We don’t create these recommendations for fun. Alacritty (a terminal emulator) for example is used in some of our applications and won’t even run without hardware acceleration which effectively breaks these applications (most likely the reason why Garuda Gamer did not work for you). The same for visual effects & compositing, these dont work well in virtual machines.