faster ram generally has dimishing returns on sustem use, however it does matter for gpu compute reasons on igpu (e. g gaming, and ML/AI would make use of the increased memory bandwith).
its not easily to simply just push a wider bus because memory bus size more or less affects design complexity, thus cost. its cheaper to push memory clocks than design a die with a wider bus.
in places outside of the US, a lot of countries have a multipurpose chat/social media app they tend to use. If you are aware of what Whatsapp is, Line is similar, but has a more east asian audience to it.