Is that a serious question?
Yes sir. Just my personal experience and opinion, but diverting the run off through gutters and downspouts away from the perimeter of the structure is advisable. It will help reduce potential foundation and slab and maybe drive from shifting, sinking and/or heaving over the years that can be caused by the concentrated run off landing in the same localized area. Thinking long-term here.
I'd also want to prevent the roof run off from landing on the entry stairs and landing. The treated wood can tolerate regular rainfall directly, but the concentrated run off from the roof is likely to speed up decay of the wood (yes even though it's treated) and could increase slippery conditions on the stairs. It could also affect the footings on the stair support posts.
It's your place and absolutely your call, but if I were doing the same build myself I'd add them for my own peace of mind.
I do really like what you have going!
