[latexr]

> I wonder if this is a regional or generational thing?

Generational is a good bet:

https://news.ycombinator.com/item?id=41537994

[Wingy]

It's definitely primarily generational. In my experience, capitalization-as-tone is used by many Generation Z people. On the other hand, it is not widely used by older generations, or the younger Generation Alpha.