Many web applications fail not because of a lack of features, but because of their architecture.

API-first approaches, single-page applications, and distributed client state lead to:

• duplicate validation logic (backend + frontend)
• multiple implementations of state and error logic
• unnecessary serialization (state → JSON → templates → DOM)
• increased attack surface due to overly broad JSON responses (information disclosure)
• additional infrastructure and cloud overhead due to separate frontend/backend deployments and API operation
• increasing complexity with every extension
• high maintenance and development costs

The system becomes slower, more fragile, more vulnerable to security breaches, and more expensive – even though it was originally launched as „modern“.