I very rarely change transmission filters. What I do is suction out the fluid in the pan whenever I do an engine oil change, and replace just that. So about 2.5 qts are changed every 5000 miles. I only do the whole change/filter procedure if I have a leaky gasket or some other problem that requires openning the case. The tranny in my 190D failed at 325K miles, which seems to be about how far a 722.4 goes in this car. New transmission is getting the same treatment.

I have many decades of driving under my belt, and I've never had a clogged transmission filter on any car, Mercedes or other.