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Clearly you’re not going to arrive at a good answer starting from first principles. Industry research groups have the numbers, but they’re locked behind paywall

Clearly you’re not going to arrive at a good answer starting from first principles. Industry research groups have the numbers, but they’re locked behind paywalls. Starting from the other end, the Stackoverflow survey has 50% of devs identifying as full-stack. Most surveys have Java as the #2 programming language, where it’s been for the last 20 years. That says nothing about how those devs are organized among teams, but I don’t think it points to such arrangements being “rare”.

Retric 6y ago
Their 2020 survey has: “About 55% of respondents identify as full-stack developers, and about 20% consider themselves mobile developers.” I always took that kind of a breakdown to mean most website developers where full stack with embedded etc being their own categories. With majority full stack teams including various specialists as needed, which fits my experience over the last 20 years. However, Android is Java and is frequently used as a front end. As things grow I normally see teams split by system, so I can see mobile being split off as their own team becoming more common even if it’s the still the minority. That said, it’s teams managing the backend teams which would be considering Java vs NodeJS and based on that 55% I think most teams are familiar with JavaScript.