That might still happen this year, it’s the next step in the development plan.
What makes these launches “non-production” tests is that they are not carrying any valuable payload. Blowing up rockets like this is exactly what gives the company it’s advantage over competitors who try to anticipate everything during design stages.
Testing their ability to deploy satellites is a short-term goal that will make them money now. Testing refuelling will be needed for Luna and Mars missions, but that’s a long way off anyway.
Honestly I thought they would be live testing fuel exchange in orbit by now. Seems pretty far from it sadly.