With the increase popularity of the linux desktop and the steamdeck, will new viruses and malwares be developed for linux systems? should we better use an antivirus?
I don't use one, it's unnecessary. Keep your system light, use only free software and utilize some of your common sense and you'll be all right.
This one time my brother had his pc(winblows) infested just by plugging in a flash-drive, seriously, just that!!. I hate proprietary software.