Simplifies tracking. Instead of needing to log every event with 8 different tools, you instead use Segment to do it once. It then sends data to all the tools we use, like Amplitude, Customer.io, Facebook Ads, Google Ads, and Intercom.
Empowers the marketing team. Once you have Segment installed, the marketing team can decide to add a new tool without bugging an engineer to install it. And in my experience, engineers hate doing things for marketers.
Pumps data from various tools into others. For example, use Segment to pump data from Intercom and Customer.io into MixPanel where you then analyze your data.
Because of Segment, you're able to make informed, data-driven decisions. You have the data you need in the tools you need. You're also able to make personalized email campaigns.
And you massively cut down on engineering resources needed on the team to handle integrating with a dozen different APIs on an ongoing basis.