Looking at language statistics in last rounds I have wondered why so many Java and so extremely low Kotlin coders?
Codeforces Round #797 (Div. 3)
CodeCraft-22 and Codeforces Round #795 (Div. 2)
Educational Codeforces Round 129 (Rated for Div. 2)
Kotlin, in rude of sense, is modern replace for Java. I do not want to note advantages of Kotlin which described everywhere.
Why you not change Java to Kotlin?