A good dev can dive into a completely unknown codebase with or without tools like a debugger and figure it out. AI makes this far easier.
Some great devs/reverse-engineering experts can do the same without even the compiled source code. Again AI tools can now do this faster than any human.
Security researchers have figured out the intricacies of a system with no more than a single string as input and an error code as output.
While the absolute dollar value of margin debt is at an all time high, margin debt as a percent of total stock market value is still significantly below historic levels.