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I write for a living, not novels or anything, but Transportation and land use plans.
Typewriters put me into a completely altered sense of thinking about writing and it can refresh me.
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Your reason 9 brings back memories; at work once, I struck up an acquaintance when she in question bounced in to work swinging what looked like an old typewriter case.
'Could you look at this for me? - The capitals don't line up with the lower case, and it's driving me nuts!'
Turned out she used it for letters and for poetry writing, and had heard that I had some TWs too.
The fix was simple enough. Narrative ends here.