No, it's because of branding. I've known even conservative wives who were doctors, or lawyers who kept their original surnames because they had established a brand and didn't want to hurt their business.
However, in law and medicine the legal names are more important so officially they probably are what they say.
On the other hand the media will often use "stage names", so while legally they may share the same last name as their husband, publicly they'll continue to use their original surname because of branding.
No, it's because of branding. I've known even conservative wives who were doctors, or lawyers who kept their original surnames because they had established a brand and didn't want to hurt their business.
However, in law and medicine the legal names are more important so officially they probably are what they say.
On the other hand the media will often use "stage names", so while legally they may share the same last name as their husband, publicly they'll continue to use their original surname because of branding.