I was being facetious. You said it yourself, it's for convenience sake alone. Because of the very minute difference in size and weight (a quarter of a pound and <2 inches in screen diameter), having both seems very superfluous to me and others on here. Better things to spend money on, in my opinion.
Ok, fair enough. But I thought this was a thread about why one would have both, not to pass judgement on the OP's financial decisions or priorities.
This may come as a shock to some here, but other people have different needs, wants, and budgets. So back to the ORIGINAL question. Why would someone buy both? I think the "other perspectives" the OP was inquiring about were from people who have chosen both, not from those who consider this superfluous. I could be wrong, but I don't think I am.