Make "public channels" heading clickable
On the desktop web interface, the "public channels", "private channels", and "direct messages" headings are not clickable. If you want to join a channel, you have to look for the less prominent "More..." link at the bottom of the list. Meanwhile, at the top of the list, the "+" icon creates a new channel.
Given that joining a channel is a much more common operation than creating a new channel, I feel like it should be given higher billing, with a click target at the top of the list instead of at the bottom of the list (or maybe in addition to?).
As an additional tweak, the "More..." link could be changed to say "Join more channels...", or have a tooltip describing that that's what it does.
Thanks for the excellent software!

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jsha commented
Some more detail here:
To join a channel on Web, you have to scroll to the bottom of the channel list and hit "More...". If you hit "Public Channels +", you get a dialog to create a new channel.
On Android, there is no "More..." Instead, hitting "Public Channels +" gives you a dialog that lets you *either* join an existing channel, *or* create a new channel. I think this is a much better user experience, and I recommend that the Web UI adopt the Android style for joining channels.