There have been several tactical mistakes lately, some of which occurred in close games where a single correct move may have scored/prevented an extra run and won a game. In a season where it looks like the Braves will make or miss the playoffs by a small margin, these tactical errors could loom large.
Snit wastes PAs on pitchers, which we saw with Folty in his last start.
Snit fails to build an optimal lineup as seen with Acuna leading off and Swanson batting 2nd.
Snit often makes head scratching BP decisions, though some of these may be due to info we don't have (perhaps Newk was sore last night).
None of these errors lead to dramatically different outcomes, but making a correct decision every time maybe adds 1-2 base runners per week, that leads to 1-2 extra runs per month, that leads to 1-2 extra wins by the end of the season. Add in a few of those types of consistently correct decisions, and it can add a few wins per year. That is the value the Braves are leaving on the table with a poor tactician like Snit in charge.