The only reason Garuda recommends Etcher is for all the Windows only newbies attempting to install Garuda. While there is nothing technically wrong with Electron based apps per se, they are totally inefficient resource and space wasters. Many other comparable Linux GUI programs are available that don't have the excessive overhead of etcher.
Do yourself a favor and install one of the good Linux only apps that aren't electron based. Why cause yourself all this grief for an app that many consider close to spyware for the data it reports back to etcher. There's just way better choices for a Linux install. Personally I recommend Suse Studio ImageWriter, but there are lots of other good choices out there without Etcher's negative aspects.