I used this for a while, but RAM consumption is even higher, as it needs to run a headless browser with all the web apps in the background. With Whatsapp, Telegram and Instagram it took about 4gb for me. Privacy isn't great, either, as you're adding yet another closed source middle-man in your texting.

Beeper is a great option if you want all your chats unified in a single, customizable, native UI. But it's not better than Whatsapp's native app when it comes to RAM usage or privacy