But electron applications that are forced by the first party (IE; third party clients are explicitly forbidden and will be an EULA violation- possibly resulting in expulsion from the platform) is an issue.
We talk about a global RAM crisis now due to AI, but I don't even want to think about how much RAM is hoarded by Teams/Slack and Discord in aggregate- these are applications that are intended to be run in the background by everybody, so you're talking at least 2GiB per person because you can be pretty sure that people are running more than one of these.
1.5GiB * the number of people in work = what.. 1 petabyte of RAM? For chat.
Compare vscode memory + cpu usage to whatever IDE you were using before that. It's probably an order of magnitude more efficient.
In comparison to Sublime, it is indeed slower and more resource inefficient- however, it is free and good enough.
Not everything boils down to technical purity, there can be other important factors.
Best example is vscode.
Are Electron apps more wasteful than native: sure. But I rather stand with Electron and that Windows, Mac and Linux is supported.