HHNXX was meant to be a closing chapter, which has not aged well given... the icons have continued to appear. The stated goal of that event was to introduce new stories, as well. Outside of HAVOC, which has appeared occasionally in other anniversary years, and Saws 'n' Steam (which became a house the next year), nothing really stuck. There were a handful of good experiences (the aforementioned two included), but FEAR disappointed in his mostly nonexistent execution.
HHN25 I think fared better after three years of lackluster Walking Dead installments. Jack being back felt like a breath of fresh air, even if they weren't doing anything particularly new with him. Again, not all the houses hit, but many were standouts, including the main anniversary house, Body Collectors, Insidious, and Freddy vs. Jason. The zones were hit or miss, but the overall had an identity that had been missing since 2021.