DEFO/DP/Flex explanation

[Dakota]

Originally Posted by whiskers_ump

A lot of college coaches and now HS coaches are making the DP/FLEX swap right after they submit
the lineup card. Don't know for sure why, but see more and more of it.

The explanation I've heard is the one I posted above. They want their pitcher to bat. And they want a way to be able to relieve her later in the game if needed while keeping her in the batting order without having to move her to another defensive position. And, they don't want the relief pitcher to have to bat.