I personally dislike the following: * They replaced a reasonably fast (on Windows) or extremely fast and native (on Linux) application with a slow and bloated

I personally dislike the following: * They replaced a reasonably fast (on Windows) or extremely fast and native (on Linux) application with a slow and bloated Electron-based client that was initially missing many of the features. * They introduced multiple different types of chats as an attempt to transition from P2P to cloud-based. Depending on when and how you started a chat, it would use one or the other system with no obvious indication but many subtle differences in terms of supported features. * The web client and desktop client (despite also being written using web technologies) had various differences, such as different parsing of chat message formatting, so what you sent differed from what the other person saw in many cases. * Terrible/no tools for managing larger chat groups. And for the mobile app: * Mobile client is by far the slowest app on my phone (even today), taking easily 10+ seconds from tapping a notification to having the chat fully loaded. (Every other chat app this is <1s) * Mobile client frequently misses or is late in showing notifications of received messages. * Mobile client used to murder my battery life. Thankfully this was fixed a few years ago.