It never rains in Southern California, but in the Los Angeles of this season's Better Things it pours, man, it pours. Pamela Adlon's FX half-hour dramedy returns this week for a fourth season that finds the show still one of the very best things on TV — but reviewing Better Things remains a reminder that so much of what the series excels at is stuff that's consistent season-to-season and therefore doesn't always reward a critical check-in.