there are many reasons why one would sequence the AR from an external sequencer.
mostly, it is because some sequencers out there are a lot better than the internal sequencer. Some people like random sequences, ping pong sequences, round robin, probabilities per step, skipping steps, and so on. None of this can be done on the AR so you can resort to using something else.
Also, some people like drawing automation in a DAW, sometimes it’s useful to see all automation lanes in one glance, and ultimately, makes precise arranging that much easier. This is a matter of taste of course.
I don’t think that everyone buys hardware to get away from their computer. In fact, at least for me, it’s quite the opposite. I buy hardware to complement my computer, not to get rid of it. The tighter the integration between the two, the better.

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