If you look at iOS development though there is much less fragmentation.
Well, sure. Because:
a) Apple has closed eco-system and there are only few iOS devices you need to support as a developer.
b) Apple is pushing developers to use new tools all the time (ask your iOS developers about breaking changes in XCode and Swift) :).
I think Google is moving towards making Kotlin main language for Android development (they still support Java developers because it's a reasonable business-decision for now).
If you look at the stats Kotlin still seems much smaller for new apps than Java:
Technically, if (when) one's app use OkHttp 4 - it's already have dependency on Kotlin stdlib (luckily it's very tiny, almost invisible if R8/Proguard is your friend).
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Well, sure. Because:
a) Apple has closed eco-system and there are only few iOS devices you need to support as a developer.
b) Apple is pushing developers to use new tools all the time (ask your iOS developers about breaking changes in XCode and Swift) :).
I think Google is moving towards making Kotlin main language for Android development (they still support Java developers because it's a reasonable business-decision for now).
Technically, if (when) one's app use OkHttp 4 - it's already have dependency on Kotlin stdlib (luckily it's very tiny, almost invisible if R8/Proguard is your friend).