No, because newer means faster processing, faster menus, more refined features, way way way better low light performance and better noise reduction. This isn’t Hasselblad or anything, this is consumer level stuff, never buy older than necessary. Newer you buy, less likely you need to buy again too.
So an older full frame wouldn't be better than a newer crop?
What sort of extra features am I missing out on? I don't just mean WiFi or whatever, but "technically", what makes a 7D better?