Increasingly, no — the two are converging, since most AI features (chatbots, personalization, automation) need to be built directly into your website and its data, not bolted on afterward. Splitting web development and AI development across separate vendors often creates integration friction and slower iteration, since neither side fully understands the other's system. A single partner covering both design, development, and AI capability tends to ship faster and produce more coherent systems than coordinating separate teams.