A lot of AI is protyping new designs. Python can toss together complex code in moments compared to other languages hours. It is perfect to quickly try something and toss afterwards. If it is good, you can convert to another language for the long haul.
Well, not only simplicity and understandability, but above all time. I mean Kotlin is very recent and does not yet have a stable community base. On the other hand Python has been on the run for more than a decade.
So, give the time to the languages mature before asking such question.