It’s still a thing. The new rule is: never end a paragraph with a full stop, otherwise it’s perceived as overly formal or cold. You can still use them within paragraphs, it’s only the very end of a paragraph you omit it

At least, that’s the rule my autistic ass has reverse-engineered. Also, lol cannot have any punctuation immediately after it like “lol.”, otherwise it comes across as flat and half-hearted. You need to restructure your whole sentence if that happens