But more to answer the OP, we've been making a lot of investments to improve our results (along with other things) -- high-level updates posted quarterly at https://duckduckgo.com/updates
Bing decided to remove it for some reason and DDG now also removes it from search results, presumably because it uses Bing underneath. For Google it's #1 page when you search "fortran".
Reading between the lines it sounds like they are only using their own crawlers and other partners for things like widgets, while all their regular search results are still just Bing.
I was going to say that if the two search engines index and rank in a similar way, you would expect the search to be similar. But, for the `uefi hack` search, the results really are pretty close to identical, and when I do the same search on Kagi and Google, I get different results. I still don't know if it proves anything, but it's a little suspicious.
Actually, now that you mention it, maybe that's my problem with SO searches I called out in another post. Maybe they've got some kind of same-source limit that becomes a major hindrance when you expect most results to be from a single source. I almost never get more than two SO links for a search on DDG, and very often neither is what I need—Google gives me a bunch more, and usually at least one is helpful. And it hadn't occurred to me, but I often end up tossing in a "!g" to reddit searches for a similar reason: not enough results are from Reddit, on DDG. (yes, I could probably do some kind of "site:reddit.com" or something, but "!g" is faster to type and gets the job done)
I use ddg as my daily driver for about 3 years as well. I do find that searching things like exact error messages from programs are a bit better with !g, but almost all other searches are comparable or better.