Multi-tenant platforms built as monoliths hit scaling and release bottlenecks as feature sets grow. Separating authentication, subscription management, notification pipelines, and core product logic allows teams to ship features independently and manage tenant-level configuration without touching unrelated services.

Inventory, cart, checkout, pricing, and fulfilment operate on different load profiles. A flash sale puts pressure on inventory and checkout without touching the returns service. Microservices architecture lets each function scale to its own demand curve rather than forcing the entire platform to scale together.

Patient records, appointment scheduling, billing, and clinical workflows involve different compliance requirements, access controls, and data ownership rules. Isolating these into separate services makes HIPAA-aligned data handling easier to enforce and audit as the platform grows.

Route optimisation, fleet tracking, dispatch, delivery confirmation, and inventory synchronisation are real-time workloads that don't share the same failure tolerance. Microservices architecture lets each function operate and recover independently a tracking service outage doesn't hold up dispatch.

Course delivery, user progress tracking, assessment, payment processing, and live session management each scale differently across time zones and usage peaks. Separating these functions allows platforms to handle exam periods, live cohort events, and subscription renewals without architectural compromise across the full system.

Content delivery, recommendation engines, user profiles, playback, and subscription billing operate at different scales and update frequencies. Microservices let each component evolve independently recommendation models can be updated without redeploying the playback infrastructure it runs alongside.