Maybe I've been listening to the wrong people, but you would think that people with two to four times more banking experience than you would know what they are talking about. So much for thinking.
No, over the years we just tend to train and pass down bad information and habits until everyone thinks they are facts and procedures.
Your concern is valid about joint payees regarding their beneficial interest in checks, especially government issued checks. My guess here is that the wife will be the sole, if not main beneficiary when this is all said and done, so the attorney felt it was just easier to deposit the check into the estate account, vs. trying to have the check reissued and such.
Since you have the wife's endorsement on the check, that says she is aware of what is going on, supposedly, I would not not worry about it.
Now if this was issued to them and they were divorced or int he process of...heheheee....yeah, then pull out all the stops!!