Call me old-fashioned, but by not browsing through the 2000 page datasheet while looking for the information you need, you also miss the opportunity of learning other information on the way, which will eventually clarify "why is the datasheet confusing on this or that point"...
Usually after reading and understanding, the datasheet becomes not so confusing anymore - and you gain insight on the microprocessor for which you are writing assembly code, leading you to making better, more efficient code.
If AI does this search job for you, your brain is not exercising, and at some point you'll have lost the ability to browse through large documents, gaining tidbits of information on the way, and progressively getting a better understanding of the bigger picture - which is actually a useful skill to have.
While it's comfortable and seemingly productive to use AI on the short term, I don't think it brings long-term benefits to us as professionals. If anything, it tends to dull our ability to analyze and understand things on our own.
Of course, do we still need to analyze and understand things on our own in 2025? An open question...