Java is a traditional and conservative language, which has its strong upsides, like the syntax being familiar to many people who haven’t used the language before. It’s a language that brought us the JVM, gave a job to many people and established fundamentals for other languages to inspire and improve on. If you don’t like Java, you can just use another language for the JVM, like Scala, Kotlin or Clojure.
More people would purchase the games if they weren’t 60€ MSRP each regardless of size and quality.
I used to emulate switch games to test them as a free trial first, then I would buy them in second hand for half the price (which is still a lot, 30€ for a nintendo game versus 14€ for Nichijou volume)