I have no problem going backwards for inspiration or style.
Happens in every other form of music - jazz, funk, rock, dub, reggae etc. Why the hell not techno? If I go see a ska band, should I lambast them for not pushing things forward into neo-ska?

If its good music its good music. If its tired and old and dull it will sound exactly that. I still find tracks that are ten years old that I've missed completely, and they still sound fresh as a daisy to my ears.

If you are always looking forward and trying to innovate you limit yourself. Looking back gives you more to draw upon. No-one's said you can't look forward and back, leftward and rightwards and always twirling.. twirling...