I think it should also be considered that not all of us who married took our husbands last name. Unfortunately, your developers assumed we all did, and my last name was changed to my husband's last name on my tree - which isn't the case. I kept my maiden name in real life, so I would also like to keep it on my tree please! Thx!
In Sweden children started to get their fathers surname in the end of the 1800s and I beleive the wifes started to adopt their husbands surname at the same time. Now when many people lives togeather without marrige they keep their maiden surname and even many married people keep their maiden names. Sometimes it is the husband that change his name if his wifes name is "better". Before the late 1800s people got their surname by taking the fathers given name and added son or dotter (daughter) which they kept all their life. So it is, at least in Sweden, just a short time in history when wifes have changed their name to their husbands name and in our trees there are mayby just 5 generations where this happend. So for the majority of people in our trees the names are not changed.
Another reflection is that when the married name is used there are times when it is difficult to see that matched persons are the same.
Anna Jonsdotter was married to 2 men. 1st Peter Andersson and 2nd to Olof Petersson. If I just know about the first marrage and the matching tree just know about the second marrage we will be matching an Anna Andersson with an Anna Petersson if settings are set to just show married name. This will also be true if we both now about the 2 marrages but dont know the marrage order and pick different order.
So I have my settings set to Show maiden name only.And never fill in Married name except for the few people that actually have changed it.