As someone of the younger generation who grew up always using mostly proper punctuation over texts, and avoided abbreviations for common terms this hits home.

I'm 28 for reference, and I get VERY different vibes from those younger than me who join slack, and those older (40+ or so). The difference in meaning for different punctuation for these crowds is SO evident, I feel like I'm always playing translator for even the language I grew up speaking and writing.

The biggest example of this is the ellipsis among the older crowd. In informal messaging that I grew accustomed to it went from being overused, to nowadays seeming like you are being sarcastic or angry about something. So among the younger crowd I see it almost never used anymore. On the other hand the older generations picked it up from how we used to use it, as a sort of pause. But they co-opted it as probably the most common punctuation used in their messaging. I'm not joking when I will sometimes receive a message from an older coworker that will contain an ellipsis every 5 words or so.

It's always been interesting deciphering the actual meaning of some messages based on solely age of the sender.

This all to say, deciphering punctuation at all in informal writing is an interesting game.