This is the answer to most what has a better career outcome questions.
Jane Street, Citadel, etc. put different emphases on different roles. However, that doesn’t mean they don’t have the divisions between traders, quants, programmers, etc. even though their functions may overlap at times.
Regarding AI’s role in prop trading and investing (but not quite the same in market making), the time will come. No one thought AI could train itself after a very limited number of games in a short period of time to beat the best human players in chess and even go (go is much more complicated strategy-wise than chess).