IDGF about punctuation in text messages. If it's enough typing to require punctuation, it's too long for a text and I either email from a keyboard or hit the little phone icon on my phone.
I don't even care much about punctuation and grammar on internet forums.
That said, as to the OP -- given I'm not a 12 year old girl, when I see or use a period at the end of any sentence, it's just a *expletive deleted*ing period.
Now exclamation points....
https://www.youtube.com/watch?v=wyRLFWF2v_U