As a technologist and former Goldman Sachs employee, here's my take. The bankers and traders have historically held the power, and LLMs gave them a new tool to maintain that power. But it's far too risky for the organization for the LLMs to have access to proprietary and client data.

The power of lawyers within banks has been increasing, and that of the bankers and the traders has diminished.

Making financial engineering tool development the strict purview of the technologists may increase their power substantially. I'd be interested to hear from current insiders if that's happening.