So not so sparingly, granted. From Aug 1 thru yesterday, it might be worth noting, Holt started 7 games and didn't start 10. Of the 7 he started, the Sox lost 1. Of the 10 he didn't start, the Sox lost 2. The Sox record in the 16 games Holt played in July is much spottier, but even there I don't think Holt was a big detriment--any more than the rest of the lineup was. Holt was/is neither the cause of nor the solution to our hitting problems this year which have been manifest. The solution was/is obviously Nunez and Devers.
I am not arguing that Holt is any better than you say he is, but I am disagreeing that you have substantive evidence that playing Holt establishes Farrell's malfeasance, ineptitude, idiocy, or whatever you want to call it. And that includes yesterday when Holt replaced Nunez at 2b and lead off. The Sox won, 5-1. Holt's made a nice play on the grounder to his left and got two hits, but he scored 0 runs because the top part of the order wasn't in the mood to drive in runs.