I'm all for a natural finish but you are always getting people on here "eek my kitchen doesn't look pristine any more".
Sure, I think it's very reasonable to point out the issues. I'm always bemused by the people who buy a wood counter top and then whine that after 5 years it looks like aged wood.
The rough-sawn thing is a bit impractical, even for my taste.
I think ply cabinets would be worse than hardwood in a kitchen (unless marine ply). Posh companies upsell real wood or ply because MDF is 'cheap' but boxy indoor furniture which doesn't move is the perfect use for it- nothing is as good.
With ply planks for the doors (or veneered MDF if solid) you'd still get the grain of the wood.
I suggested spraying the whole lot rather than a stain because I think it will be hard to get the uniform appearance in different materials and personally I'd rather have that sealed surface to keep moisture out.
You could make the whole lot from rough sawn pine with a stain (very cheaply) and if your kitchen is dry enough it will last a good long while.
Problem is you can't use treated pine because you aren't sealing the surface and the treatment is carcinogenic. This is true of the MDF or ply I suggested above.
So if it has to be that rough look and you wanted it to last 20 years I think it would have to be expensive hardwood; though I recoil at the idea of doing that to it.