You can use WhatsApp in your browser: web.whatsapp.com No 1 GB or installation needed Why is the desktop app even a thing?
the desktop app is considerably faster and more responsive.
the deaktop app allows OS level shortcut keys
the desktop app is easier to work with when applying parameters in programs like excluding it from my VPN or for sandboxing or for isolating network traffic. Or for looking at how much space it takes up on disk. (im not a web developer), it doesnt cause any confusion or mistakes to be made as its logical separation in OS is clear, this is also faster
the desktop app has better keyboard shortcuts that dont collide with your browser, and the same with right click menus
I can easily video call from various PCs while still not trusting my browser with camera/mic permissions