I actually think Scooby-Doo playing into the trends and archetypes of the 70s is exactly why it's had such longevity in a time when even Yogi Bear and the Flintstones are starting to fade from the world's memory. What some more world-weary kids in the 70s could've seen as "Fellow Kids"-ey and pandering, kids in the 2020s see as something completely unique with its own wildly different tone and characters from the other cartoons marketed to them.
We could argue all day about the artistic quality of the original Scooby-Doo, Where Are You? show and its many barely-different spin-offs, or if rerunning and remaking old content is a loving way of paying homage or just a lazy compensation for original ideas, but there's a reason why these 5-decade-old shows see reruns just as much as their modern updates: it's not nostalgia, it's anemoia - and I think that's more universal a feeling than we acknowledge.
We should be championing new concepts, don't get me wrong, but - given they're provided with historical context or outdated content censored - passing down cherished favourites to the next generation won't hurt anyone, and kids are more than smart enough to know that older does not equal worse.