a greater need for DIY, because we can never expect the best attention from any yard.

Good yards have better skills than me in everything, BUT we are unlikely to get the best people from the yard. The manger, for good business reasons, puts his best people on boats owned by his regular customers. The result is that we can usually do work as well as the yard, and a LOT cheaper.

We do most of our own work. In the past 10 years of 6month/year cruising we have done about 90%.
Of the work hired out, about 50% has been done abysmally badly, usually expensively. In all cases, we ended fixing it on our own nickel because the yard (sometime 500+ miles away when the problem surfaced) simply dragged its heels and wore us out.
Most recent example. I would have to sue a rigger in Fehmarn in Germany from Norway for $1500 over a badly installed roller furler. No point. We fixed it ourselves.