First I am not saying that MBF doesn't wear out. But. Could it be that it just needs a good cleaning. Just started having issues on a press that has over 100k on a MBF.
After removing it noticed it had a build up of "brass" on it. Under certain light it was brass colored. Not a bur or buildup of any kind. Cleaned it ,polished it, put it back on the press. Adjusted . Works as good as new. I have a spare just in case. But don't see the need to change to it.