Retired schoolteacher or OCD? 😉 Paragraphs are only useful when you are separating points into order to make an argument,when you are just rambling/ranting with no logical progression of a point to prove then paragraphs are pointless...
I don't mind whether people use paragraphs or not .... however one of the unintended benefits of doing so .. is that when reading, we scan blocks of words, not each word.
It is easier to do this with well spaced "blocks" rather than one big seamless mass.