I agree. Hand-taken notes are valid. If a single individual wants to follow me around in the physical world and record my every action, then so be it.

But if the single individual begins using robots to follow me around, it becomes problematic. The issue is in the power of the technology that is deployed. What's less clear is where to draw the line: can the shopkeeper type his notes (yes), but can he fill his store with surveillance cameras that correlate my every entry into his store (this one becomes unreasonable and this is the case for which we need laws).