Recently I've installed Garuda Linux, I wanted to give it a try. I haven't used it very long, but I'll give you my feedback so far. The amount of software's that come pre-installed is actually a lot. I've spent a lot of time removing a lot of them.
In the future can you create an option, when installing Garuda Linux, to choose between all the apps you provide by default and let the users have a bit more freedom. I know Barebones exists, but that's a lot of work and I need some of the default applications. What I don't need is Cheese, or Htop, Gkthas, and similar kind of apps. My feedback would have an advance option that lets you choose if you want these apps.
Optimus Manager isn't, by default, built for GNOME. It's also not working in Garuda Linux because I assume you are missing some of the requirements. In order Optimus Manager to work on Garuda Linux, you need a few programs. GDM-Prime I think was one of them. You can check GitHub to see what you need to run Optimus Manager on GNOME.
Most of my experience so far has been great, what I've noticed though is that the boot time is really long. Compared to Fedora, PopOS, Arch Linux, it's about 1.5 times longer then those Distro's.
I recommend that you check which softwares work on GNOME. A decent amount of the software's you use might work on KDE, but they don't work on GNOME. Besides these points, I think Garuda Linux is doing great. It's been very popular and it's only been a few months.