SJS: Halachicly it is true, even if the wife works and the husband learns, unless she says I want to keep my money (which in that case he does not have to feed her (which as you pointed out, may be true anyway)).
Besides, this is only for “earnings”. Presents given from husband to wife are excluded.
In healthy marriages, the spouses come to agreement on financial matters. If there is a practical effect of this halachah, it must not be a very good marriage.
Well said. My guess is the practial part comes in only if they C”V divorce.