We had seen all sorts of things ...
Tell me bout it!
This old farmhouse was owner-built, and much later wired, before codes and inspections. The biggest tell that it is primitive, is that you see exterior siding if you are in the bathroom and look toward the wall that separates it from kitchen. Ie, the first add-on was indoor plumbing.
Grandpa didn't do much to it when he bought the place in 1950. Dad and I (as a little kid) replaced the mud-sill foundation (redwood planks on the ground, rotted) with piers and posts a few years later. I'll skip more similar stories but Dad's advice for when I eventually inherited it, was to tear down and build new, you can't repair stuff as fast as it is disintegrating. But I chose to maintain it instead. This isn't our principal home, we only spend half our time here.
Now, I'm just patching stuff and and giving the same tear-down advice to the next generation.
I saw the online photo of that goofy new deck after I finished repairing the deck stairs here last week. That photo made me think how non-standard design here has made repairs more complicated.
Below is a photo.
The outer edge of the first stair tread crumbled away if you stood right at the edge. And the stair rail post at the bottom stair had rotted, this explained why it didn't feel solid even after I ran an additional bolt through it recently.
Replacing the lower stair tread, I found the redwood stair stringers rested on brick pavers, but gopher dirt had buried the contact point so all the stringers were rotten along their lower edges.
I had some old full-dimension 2x12 first-growth redwood plank scraps, and made partial scab stair stringers to bear down properly on the pavers and support the stair stringers. My air framing nailer was invaluable for attaching these alongside the stringers since there was no room to swing a hammer, or drill for bolts, in the now-narrow space between stringers. I also replaced the 4x4 newell post. This bolted securely to the adjacent reinforced stair stringer and went all the way down to bear on the paver beneath. The railing now doesn't feel shaky.
With new redwood for the lowest stair tread these stairs are good as new

.