When do I need segment.io for analytics?

Which generally means you don't need it. One of the worst habits/pitfalls we all can fall victim to in startup world is doing something cause we think it might be helpful or important. Sometime this is fine, but I always try to avoid it when it requires another integration point.

Startups are usually having to move quickly, we all make mistakes, recover and move on etc. The more integrations you have that are not 100% providing customer value only make your system more rigid, less flexible and slow you down.

Basically, my general rule is you should only add an integration or service when it shows clear and demonstrable benefits for your clients. That doesn't mean the tool (always) directly benefits your clients but that you can demonstrate a way in which it likely will make you do something better for your clients. If you cannot show the clear and strong benefit then don't do an integration, yet. When you can show that benefit, then add the integration.