Lack of drain pumps is one reason commercial/laundromat washing machines last for ages, if not forever. No drain pump also means that these machines do not have to slow down spinning during high foam and or water draining situations, thus each spin gives full extraction. Finally no drain pump in theory means one less part to maintain/repair.
One reason one prefers hauling large down duvets to the laundromat or sending them to a commercial laundry is that those large washers do not mess around when it comes to spinning/draining out the massive amounts of water such items can hold. It is kind of scary to feel the vibrations coming through the concrete floor as the machine ramps up to speed, and watch cascades of water pour down the window of the washing machine door. On domestic/pump washing machines so much water would surely slow down the pump, and if the water amount was great, the spin cycle might time out before total extraction.
My vintage Miele using a series of short (30 sec) spins before the main final spin to help make sure much of the water is gone so the final spin can do it's job.
Miele washing machines and chlorine bleach:
According to the Miele techs one has spoken to, contrary to popular belief, it is the electrical components inside the drum (one presumes the sensors that deal with heating and such), that are sensitive to chlorine bleach damage. Miele's new uber washers sold in the United States allow use of LCB, though the warranty on the tubs is no longer lifetime, IIRC; and the outer tub is fiberglass.
Chlorine bleach and European laundries:
Europeans have in general not be huge fans of chlorine bleach (eau de Javel in France), mainly because even back in the 1700's it was known chlorine bleach weakens and can damage textiles, especially linen. Many well off households stuck to bleaching fields and then boiling with perborate bleaching and or sent their laundry out to the country (where one assumes clean air and land could be found for sun bleaching). Story is that some very wealthy French familes would send their laundry off to the French West Indies to make sure it was done in clean water and fresh air/sunshine.
Being as all this may, there are simply certian stains that will not shift with oxygen bleaching, and or would require such long boiling times the stains would not shift, that using a quick chlorine bath is the only remedy. Commercial laundries have access to a rather powerful chlorine bleach designed to "reclaim" badly stained linens. We're talking about items so badly stained that if the bleach ruined them it wouldn't matter as they were otherwise going to the rag bin.
L.