I believe the problem with chlorine bleach and older Miele's with stainless steel outer tubs is that the bleach, theoretically, can bead up and concentrate in spots, presumably if the washer is shut off whilst it contains bleach. Then, evaporation would concentrate the bleach until it started to attack the stainless steel. Over time, if left long enough, these concentrated spots can cause pinhole leaks in the stainless steel. This is a known problem for home beer brewers who use stainless pressure vessels for their brews, and disinfect them with chlorine bleach and don't rinse them out promptly and thoroughly. Stainless steel's Achilles heel is the chlorine ion. For this reason, most stainless cookware advises that if, for example, one is boiling water for pasta, that one add the salt after a roiling boil is achieved, so as not to concentrate the salt on the bottom of the pan at high temperature.
The 4000/4800 4 cu ft Mieles have plastiglass outer tubs, not stainless steel, and therefore presumably are immune to the problem.
I also was a bit non-plussed, considering Miele's history of inveighing against the tilted tub, to see that the newest 110 volt 4 cu ft models for the American market feature not-perfectly-horizontal alignments. Whatever happened to the vaunted "fall height"???
In any case, the Neptune 7500 has a fairly pronounced tilt, at 15 degrees. Other washers, such as the Whirlpool HE series, come in at 13 degrees. The LG, as I recall, has an 11 degree tilt. Don't know about more recent offerings or the Miele. For the Neptune, most of the time the tilt is not an issue. For hard-to-wet bulky items - like car covers or thick comforters, I notice that the front of the load doesn't get wetted down as soon as the rear of the load. Usually for these I program in more time for the wash, or a pre-wash, to help saturate everything.
