alt Hacker NewsOps person here who has supported Java/SpringBoot applications. I think most of dislike of Java apps comes not from language or framework BUT from fact that most Java using workspaces are filled with mediocracy. They tend to be businesses with products that have extreme moats and thus quality of software barely matters. I imagine most people who would even read this medium article are dreaming of better than that.
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There are certain non-software industries that seem to have strong hiring preferences for workers who started in the industry over computer science chops, and a lot of those tend to use Java. For example, biotechs.
Alternatively, I think of Java and Spring Boots as being incredibly valuable by letting companies that don't really have software as a core competency to make reasonably performant and structured applications.
Mediocrity will never not exist, and you unlock a lot of value by optimising for it.
I 100% agree. I have seen enterprise spring applications that throw away all of the speed through huge amounts of hot path object creation, nested loops, absurd amounts of factories, etc. After going through enough AbstractFactoryFactory calls to make object in an n^3 loop, the framework doesn't matter.