...with the fence analogy. And I think that fitting is super important.

But for a fence, it's unlikely that I'll find an affordable builder that's as good an engineer, as patient, and as capable as I am. I'll do it myself, since I'll consider the subsoil, select materials based on the needed environment (wind, moisture, freezing/thawing), measure and design with strength and function in mind, consider maintanance/upkeep in selection of finishes, hardware, fasteners, etc. And, I'll build it plumb and straight. The gates will work, and they'll hold up, too. So...I'd rather build it myself.

I've been riding now into my 5th decade. I also have fitted myself to my six bikes. They're not identical, but they are right for me for the way that I ride them. There're no pain or endurance issues. And I have had back surgery and must work to keep loose in the hamstrings, hip flexors and IBS. So...