Why the ESV Made this Decision on...

I believe only the translator(s) could correctly answer this question.

 

What an interesting observation!
I've alway had problems with this passage.
The main difficulty I have stems from the phrase, "...because of the angels".

Re: woman/wife
The ESV's footnotes help explain things.

wife, vs 3 - - - Greek gunē. This term may refer to a woman or a wife, depending on the context

wife, vs 5 - - - In verses 5–13, the Greek word gunē is translated wife in verses that deal with wearing a veil, a sign of being married in first-century culture

It is strange how verse 7 uses the word woman and footnotes Proverbs 12:4;
An excellent wife is the crown of her husband, but she who brings shame is like rottenness in his bones.
ESV

Additional footnotes lead to Genesis 2 where "woman" was created, I'd guess that is the key for the switch.

I like the ESV's take on this passage...don't know if it's right,
I'll have to study it out a bit more sometime.

Rob