Experience matters. Bill Clinton was a newbie to Washington DC and was also relatively young in age - he was just 47 years old in 1993. The DC politicos weren't going to let young Bubba from Arkansas bully them .
Joe is the opposite of Bill. Biden has almost 50 years of experience in the DC politics and he's the oldest president ever. A key problem for the last 3 Democratic presidents before Biden (Carter, Clinton, Obama) is that they lacked deep knowledge of DC politics. Jimmy Carter was a peanut farmer and governor in Georgia. Bill was just a good ol' boy governor in Arkansas. Obama was just a one-term U.S. Senator.
Joe has the most political experience of any Democratic president since Lyndon B. Johnson. Hopefully, Joe will be similar to LBJ when it comes to domestic policy but obviously much better than LBJ when it comes to foreign policy.
Never thought of Democratic presidents from that POV, thanks