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Haha oh god, in one fell swoop you’re acting like writing Android apps is just knowing how to write Java and writing Java is just like writing any Algol-like.

A: I've written a couple.

B: Anyone who knows any ALGOL (exception: 68), Pascal, Oberon, so forth, will get Java in minutes.

You have no idea what Android is if you think it’s development process vs Java (which Java? Embedded Java, desktop with JavaFX? Server side?) is like FreeBSD vs NetBSD.

Maybe more like FreeBSD vs Windows and you’re trying to write a UI application, but technically you can use C on both platforms so it’s the same right?

You're demonstrating reasoning flaws, alongside misinterpreting my words. Writing an application for, say, NeXT, back in the day, isn't different at all from writing a modern Mac application. What you do carries over. It's the same basic steps every time. Write a desktop Linux application, write a desktop Windows application, write a Mac application, write an iOS application, write an Android application. You'll have to use a few different wrappers or libraries, but it's not a new skillset.

You claimed that learning a new language is giving yourself a new skillset. It's not with the majority of languages, especially languages like Java, which introduce little compared to their immediate predecessors outside of syntax changes.

By the way do you actually think syntactic differences are all that separate languages so once you know the general syntax you pretty much know the language, or are you pretending to not know how programming in multiple languages actually works to prove a point?

This is a frankly ridiculous comment. ALGOL-derivatives grab more from ALGOL than syntax, and some don't borrow syntax at all. Any Pascal programmer can go from writing Pascal to Oberon to Java to ALGOL to Go with ten minutes per language, in any order, despite the differences in syntax. The languages are not differentiated strongly enough to matter; that C programmers could go to writing Java in the span of a day was a major selling point that Sun used, and C and Java are more different (though again, not that different) than any of the previously-listed languages.

Any J programmer can go from J to APL to K to Nial trivially as well, despite vast differences in syntax. Knowing one or the other doesn't mean you have a differing skillset.

The same is true for most Lisps (Connection Machine Lisp being an exception, as a counter-example; despite that, knowing any of these isn't a new skillset).

Just because something requires you doing something slightly and superficially different than what you were already doing doesn't mean it's magically a new skillset. Defining finding new libraries as "new skillsets" is just silly, and erodes the meaning of the term.