Normally appointments for federal judge are for life. Aren't recess appointments only effective until the end of the next session of Congress? I don't see much value in such appointments; at least not for judges.
We get them for three years and they can still be confirmed for permanent placement during that time. The judges can each hand down a few decisions and the Senate will have at least a true record as to how these judges will perform before permanent confirmation.
The real issue is other appointments--Trump may have as many as several thousand non-judicial PAS (Presidential appointment Senate Confirmation) appointments on which the Senate is standing still to prevent him from implementing his agenda--those people all get in on recess appointments.
Mainly it would be good to clear away the backlog of executive appointments. Appointing a bunch of judges via recess appointment gives us the advantage of having a whole bunch of conservative judges issuing decisions over the next year.