That is quite frankly disgusting, and not reflective of an average dishwasher with a filter. Not even the very neglected dishwasher of my family member was that bad when I used it.
If you choose to believe filter dishwashers don’t work, or simply prefer one with a macerator that’s absolutely fine - but one can’t deny that the system works quite fine for me, friends and family, other European members on here, and millions of other households outside America, and no doubt within too.
BTW - our dishwashers can be connected to hot water, however they are so water efficient nowadays that by the time the combi boiler has initialised and heated up, in most cases only the lukewarm (at best) water resting in the pipes is used - by the time hot water reaches the machine the fill cycle has long been and gone. In some rare installations with solar hot water or pressurised hot water systems it would be somewhat useful, but more often than not it isn’t worth the bother in normal installations without wasting water by purging the system.