Watch the games and remember. Richards has been good in relief precisely because they use him in long relief. He's gone 8 innings giving up 1 run out of the bullpen. For now, anyway, no way do they send him into a situation like the one Whitlock faced in the 9th last night.
Season to date, the Sox starters have averaged about 4 innings per start, so a guy like Richards could be useful if he can keep getting guys out.
Lately, Barnes looks awful, Ottavino only a tad better, Taylor the same, and lefty Hernandez is still on the IL. Sawamura has been steady, and Whitlock has been brilliant, last night being a great example. Two reliables aren't enough, so those other guys, even Perez and certainly Richards, are going to get opportunities.