Ecommerce web apps often become complex when you start dealing with scaling, integrations, and performance optimization. Many teams face issues with inventory sync, checkout reliability, and maintaining speed as traffic grows.
A practical approach is to focus on strong architecture early and rely on experienced teams offering custom web app development services, since they can tailor features around business workflows instead of forcing everything into pre-built limitations.
In most cases, a hybrid strategy works best  custom core functionality combined with trusted third-party tools  so the platform stays flexible, secure, and easier to scale over time.