Ortiz was 'kept in' because at that time Murphy would've been happy with making it a one-run game, and Ortiz was more than capable of advancing the runners into scoring position w/one out & two of the better hitters on the team looming. No one is 'in over his head', except apparently Yelich in the following AB.
Check around. You seldom if ever see a manager make moves like that in the fifth inning, when you have the same spots in the order coming around again in a couple innings & you only have four or five position players, and only one of them a MINF. It may have been part of the reason Vaughn was held back until the 9th inning in game 3.
The A's did that in the 70s. they had three or four guys who could play 2B, none of them particularly good hitters, and would often PH for them. But that was when you had seven position players on your bench. Usually the only early moves these days are when you more-or-less script it, like Counsell the other day when he waited for a RHP so he could then insert Busch.