"Mrs Steve" may be jocular, but at least it indicates that we are a married couple and there's no hint of inequality, condescension or property-owning there (as in "my wife," etc.).

"My wife" is no more possessive than "my brother / sister / mother / father / aunt or uncle". It shows a relationship, not a possession.

"Mrs" is almost always adopted alongside a change in surname to that of the husband. In formal terms, the couple would be addressed as "Mr and Mrs Joseph Bloggs". How much more unequal amd condescending can you get?

DC