If one is careful about emptying pockets, putting small items into net bags (especially brassieres with wire supports), and so on there shouldn't be anything to be caught by front loader's sump/drain area.
My Miele and AEG all have drain "filters" that one is supposed to check and clean now and then. Have found nothing in years of using each except maybe odd button worked lose during laundering.
Many of course don't follow such instructions and that's where trouble starts. Infant socks, those infamous wires from brassiere and other bits sooner or later end up working their way down into pump "filter" area. At best customer themselves can clear area of offending pieces. Other times a service call out is done where tech pulls out all sorts and owner has sheepish look on their faces "how did that get there?".
On commercial/industrial/laundromat washers that don't have pumps but drain into a pit or trough you find all sorts. Coins, buttons, small bits of clothing...
On h-axis washers without rubber door boots (such as Asko and nearly all commercial, OPL and industrial washing machines) it is perhaps bit more important to clear pockets and so forth.
