I don't think so. A basic consumer-oriented harness is a commodity (zero moat: you can ask one harness to write you another).

State-of-the-art models have more of the workflow sensibilities built in, and don't need as much help from the harness.

Where harness helps the most is very customised personal workflows (not a textbox for a prompt, but an end-to-end IDE for how you develop software) But then it's best to have your own, rather than some closed-source rigid product.

Harnesses help smaller models, and very tightly hand-holding harnesses are needed for models runnable locally. I think that is very valuable to users, but avoiding paying for the biggest models is the opposite of what the frontier labs want.