The value of a Bloomberg Terminal isn't the UI (which is famously terrible/efficient); it's the latency, the hardware, the proprietary data feeds, the chat network, and the reliability.
Building a React frontend that fetches some JSON from an API in 2 hours is impressive, sure, but it’s not the hard part of fintech. We need to stop conflating "I built a UI that looks like X" with "I rebuilt the business value of X."