There were a number of reasons for this change, some of which I was aware of whilst creating the Jekyll site, and some that only became apparent when looking into how to make future changes to the site that I was initially ignoring to allow me to get something live.
Looking at the list of issues closed off by the migration, some
of them are clearly because I didn't know what I was doing with the initial
Jekyll skeleton, resulting in a lot of near-duplicates in the config. And some
of my annoyances were pretty minor personal preferences (such as all of the
Jekyll directory names being prefixed with
Reading about other people who have made a similar migration, the common concern seems to be about performance when building a large site. This isn't something I imagine will be a problem for the forseeable future, but the thing that does appeal as the amount of content grows is the fact that Hugo keeps all of the site content within a directory, keeping the repository cleaner as the only files in the root folder now are for CI or configuration.
Perhaps this just shows the avantage of getting that first bit of momentum, and actually completing the first iteration, encouraging continued change. I don't think I would have developed this site nearly as much if I hadn't even completed the first version.