Probably a generic failing of "X wing" format of footswitch rather than
RoHS. Because of the X format the contact surface to the tipping contact is
a point rather than a line so it punctures through the silver? plating of
the tipping contact, into ther base metal. Then an irregular surface to trap
contamination etc inside the pit . Regular format like standard toggle
sw would have the fixed contacts appearing as a line because orthogonal to
the casing rather than 45 degree set.
By X wing I mean this external appearance
http://t3.gstatic.com/images?q=tbn:OPXHa_CHLpMgiM:
rather than
http://t2.gstatic.com/images?q=tbn:jrpyuMl8iMi8tM:

Who designs these things? probably graphic artists or media consultants
because the X appearance looks good.