Most travel ball teams average 1 run per inning, or more. So putting a batter on base in the middle of a team's lineup probably increases the chances of the opponent scoring more runs, even if it's a great hitter getting the free pass. The higher the level, the lower the run expectancy, the more the IW might make sense, but in most travel ball settings, I'd guess it's not a good idea.
Also, as a coach, my priority would be player development, so I'd rather see my pitcher compete vs. a good hitter than me complete against the opposing coach.
Also, as a coach, my priority would be player development, so I'd rather see my pitcher compete vs. a good hitter than me complete against the opposing coach.