I'm an Android developer who despises Kotlin, reactive programming, and "the Google way" in general. My main gripe with all this is that it needlessly complicates everything that can already be done in Java with vanilla SDK. All these additions are touted as a way to write fewer code and do it faster, but the problem is, it's all rather complex under the hood and requires you to hold a lot of context in your head at all times. And if you want to read someone else's code, you gotta have the encyclopedic knowledge of Kotlin, because characters are apparently a dollar each and it's not like we can spare some to write code with actual words people can search for. And to make it even worse, "the Google way" is a moving target. It's constantly evolving just for the sake of change.

In the end, I'm sticking with Java and vanilla SDK because it just works and only changes ever so slightly with each major OS release. Also my apps run pretty darn fast on 7-year-old devices because they only use the CPU to do useful work.