I think the main difference is there's just an order of magnitude more awful Java devs than Go developers due to Java being the most popular backend language for N years.

If the timeline was flipped and Java was the new language on the block while Go had been around for 25 years, I bet you'd see the quality of Java code was vastly superior simply due to Java attracting passionate developers interested in learning new technology.

I still see Java devs with 15-20 years "experience" coding like 1st year CS students. It really wouldn't matter what language they were coding in.