The Slack desktop client implements multiple teams basically the same way Chrome implements multiple tabs. And we all know the rule of thumb: you can create one Chrome tab per gigabyte of memory.
It's remarkable how bloated browsers have become.
I remember having multiple Netscape 3.x windows open back in the mid-90s, on a 486 with 32 megabytes of RAM.
Sure, but browsers today are incredibly complex runtime environments that support all kinds of apps. That inevitably results in bloat.
Agreed, but not orders of magnitude more complex. It's not just browsers... all software suffers from this bloat.