I’m told it’s because the period is considered passive-aggressive. I assume it’s too formal final; maybe The Kids These Days hold out hope that a sentence might not really be over? At any rate whoever got the McDonald’s account embraces it wholeheartedly.

Only when sending a one-sentence text, where the beginning and end of the sentence are clearly the bounds of the text itself. You see periods still between sentences of multi-sentence texts. Sometimes other markers are used like ellipsis or emoji.

I really genuinely like this change for orthography. The feel & sound of spoken language is highly sensitive to the context and formality: you talk differently giving a speech than you do at dinner with your family etc. It's cool that we're adapting the written forms to more completely express the full range of formality that we actually produce written language in now.

The details of orthography are all just convention and tradition anyway. As much as it pains prescriptivists and peaked-in-high-school wellactually pedants the true language is the spoken and writing is merely a tool we use to represent it. These additions make writing a more complete & capable representation.

And from a more CS view it's cool too. We've hijacked sometimes-redundant punctuation to convey nuances of tone and intent. Essentially increasing the "bandwidth" of writing.

Similarly for bullet points – no full stop required.

You would be surprised by how often people ignore those on their verbal discourse.