Of course there is nothing wrong, exactly, with the modern representations. But there is a charm in the old depictions that is missing in the newer ones, and that's especially evident in Old-School Snoopy.
The evolution of a comic strip is an interesting thing. The Garfield of today is unrecognizable compared to the Garfield of the strip's beginnings, and that was in 1978. In that case, they began as remarkably unattractive characters, enough so that one can only think they were intended to be ugly. Peanuts went the other way; strikingly composed and sharply designed characters, over the first few years of the strip, transitioned into slightly more realistic, yet definitely less attractive realizations.
Why would Charles Schulz move towards lessening the cute-factor of his characters? My theory is to stave off a perception that his work was kid's stuff, which would be especially important as the strip began to lift off to philosophical heights and cultural relevance. Of course, you may have different ideas.
