portico: Update why-zulip.

Originally we wanted it to be short, since we were worried about attention
spans. But it seems like people are willing to read quite a bit when
choosing a chat product, and our "10 second" pitch should just be a video,
rather than a small amount of text.

templates/zerver/why-zulip.md

@@ -4,28 +4,52 @@ in chat. If you haven’t seen Zulip in action, log on to our developers’
 server at <https://chat.zulip.org>, or check out our short screencast
 (coming soon) on topics and threading.
 
-## Asynchronous matters
+## Zulip vs. Slack
 
 Zulip’s threading model allows for long-running conversations to co-exist
-with real time chat. This allows remote team members, part-time contractors,
-internal clients, and others who aren’t going to be on your chat full-time
-to participate effectively.
+with real time chat. This allows senior staff, remote team members,
+part-time contractors, internal clients, and others who aren’t going to be
+on your chat full-time to participate effectively.
 
-## Usability matters
+In Slack (or Hipchat, Mattermost, or many others), if Bob starts a
+conversation in a busy channel at 10am, and Ada swings by sometime in
+the evening, there is no way for Ada to effectively participate in
+that conversation. If Ada is a manager who spends most of her days in
+meetings, or is a remote engineer living 8 time zones away, she won't
+be able to participate in most conversations at all. This means that
+in an organization that has adopted Slack, the vast majority of Ada's
+conversations will still be over email, during meetings, or over Slack
+direct messages.
 
-Email is clunky for real-time communication. A thread with even 100 messages
-feels cluttered and slow, whereas real-time chat conversations (on any
-platform) regularly exceed that. Typing notifications, emoji reactions,
-keyboard shortcuts, and blazingly fast clients make Zulip a daily
-pleasure. Usability is important; if people don’t like a communications
-tool, they just won't use it.
+By contrast, Zulip's lightweight threading model allows busy team
+members and remote workers to fully participate, even if they are
+reading messages hours after they are sent (or the next day!). This
+enables conversation that would otherwise happen over meetings or
+email to happen in Zulip itself. It also enables easy participation
+and information spread to those that have the least time to attend
+meetings which have only a nugget of information that is relevant to
+them.
+
+## Zulip vs. Email
+
+Email is clunky for real-time communication. A thread with even 50
+messages feels cluttered and slow, whereas real-time chat
+conversations (on any platform) regularly exceed that. Typing
+notifications, emoji reactions, keyboard shortcuts, and blazingly fast
+clients make Zulip a daily pleasure. Usability matters; in an
+organization that relies on email for communication, things that could
+have been resolved over chat end up being pushed to meetings instead.
 
 ## Zulip changes the way you operate
 
-The Zulip project currently has over 30 full-time engineers, working from 10
-different countries. Outside of one-on-one conversations, Zulip doesn’t have
-a single phone or video-based meeting. Zulip also has 0 internal mailing
-lists, and 0 internal email discussions.
+The Zulip project has over 30 core team members, working from over 10
+different time zones and 25 different locations. Outside of one-on-one
+conversations, Zulip doesn’t have a single phone or video-based
+meeting. Zulip also has 0 internal mailing lists, and 0 internal email
+discussions. By contrast, even Slack doesn't rely on Slack for remote
+work; their
+[careers page](https://slack.com/careers/location/all-locations/dept/all-departments)
+doesn't list a single position where you could work from anywhere.
 
 Threaded conversations mean that all stakeholders can see and respond to
 every message, just like in meetings and email. But unlike meetings, Zulip
@@ -34,7 +58,7 @@ commitments from folks that just need a 5 minute update. And unlike email, a
 lively discussion of 300 Zulip messages is just as easy to digest and
 respond to as an in-person conversation.
 
-### Read more about how we’ve made Zulip work for you
+## Read more about how we’ve made Zulip work for you
 
 * [Zulip for companies](/for/companies)
 * [Zulip for open source projects](/for/open-source)