Go is 12 years old (1.0 in March 2012). Young compared to Java, but old enough for codebases to have gone through a few write-rewrite phases. Case in point - this thread is about code that Walmart got when it acquired a company founded in 2014.
Sure, but Walmart is moving from a niche language to a mainstream one. Significantly easier to make that business justification. Go to Java should require a lot more political capital to champion such a change.
For what it’s worth, the 2023 stack overflow survey said 14% of professional programmers used Go vs 1% for F#. (Java at 30%)