Not every team does. If you have a single product with a small team, a shared set of conventions might be enough. Design systems become valuable when multiple teams or products need to stay consistent, or when onboarding new people needs to be faster.
The tipping point usually comes when you notice duplicated effort across teams, inconsistent user experiences across products, or new hires taking too long to become productive because there are no shared patterns to follow.
We can help you assess whether a design system is the right investment for your organisation, or whether a lighter-weight approach would serve you better.