It never was? The Android client takes 10 seconds to start, runs my device hot and the UI is so bad that the first time I tried to respond to a thread I couldn't figure out how to get out of the thread view.
The desktop client uses 1GB of memory gobbles my CPU and takes 20 seconds to start.
The "least bad client", the web client still takes 10 seconds to start, for no obvious reason. Last week I looked into it, it turns out that every time the client makes a request to the server it the TTFB is 300 to 500ms, on a connection with 40ms ping. So their backend is just as fucked as all their clients.
Even their email notifications don't work: every time I click on the link they send me it doesn't take me to the mention!!!
They did corner the market so clearly they must be doing something, but really I just can't see it. I'm completely stumped.