I once was using a bunch of handmade python scripts to work with terrain heightmaps and ground terrain textures in an attempt to improve FSX visuals before flight sim 2020 was announced.

I had 12Kx12K pixel images of the ground in spring, and wanted to make some winter versions for fun. Some basic toying around showed you could reasonably resample a "snow" texture into these photos wherever you had pixels that were "mostly green", ie grass or trees.

I wrote this up in python using the simple PIL python library for working with image data. It took 45 minutes per image.

I fired up a text editor and within 30 minutes had a java version of the code, most of that time was spent remembering how to write java.

30 seconds per image.

I don't care what nonsensical "optimizations" I could have done, like oh just pull it into numpy arrays and work there, oh PIL is slow for pixel manipulation so don't do that, oh you could rewrite it like X and it will be faster

I don't care. The simple, naive, amateurish attempt in Java, a language I hadn't touched in 6 years, blew the pants off of the python version, a language I used at my day job. It took zero more effort to write in java than in python. Python is great for doing simple one off scripts, but it is terrible at actual work.

Add to that, the tooling around python is mediocre, and for some reason python programmers don't seem to care, while the tooling around java is so good IDEs basically write all the supposedly awful boilerplate code for you. Stuff that I had to do by hand in python was automated in java.