How would Proto-Indo European Evolve?

How would the language evolve if the PIEs stayed in the Pontic Steppe and only migrated into Anatolia? What sound shifts were also the most common amongst the daughter languages.
 
That's a...very hard question to answer, if not impossible. Just because certain shifts happened in OTL doesn't mean they are also likely to happen ITTL.
 
It's really hard already to know what was the state of PIE after Indo-Hittite differentiation and when this differenciation happened : assuming a Chalcolitic migration of proto-Anatolians, and that the pre-IE languages substrate weren't formative in the constitution of other branches of IE (at least in Europe)*, it doesn't let much certainties (outside the glottochronological method, which I find dubious at best).
I'd still be tempted to say this PIE evolution would be more conservative and closer to Anatolian language than how it did, partially due to its lack of variety, partially due to its closeness to Anatolia, but to eventually be more vulnerable to linguistical influence from other regions, demographically-wise. But that's pure unsupported broad opinion.

*I'm personally unsure for the former, slightly more trusting in the latter.
 
It is impossible to say. We barely even know what PIE exactly sounded like. If PIEs never move outside of the steppes and if only Anatolians have separated it would cause massive butterflies. I am not be sure if PIEs would even survive in long terms.
 
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