That's just not true about Illinois. The 6th district is only Biden +8 when it could have been Biden +15 if not for the VRA requirement that IL-01 and IL-02 need to be majority or near-majority black. IL not only kept it's 3 black VRA districts together but it added a 2nd Hispanic VRA district (plurality, not majority) which also weakened the 6th and the 11th districts.
Don't get me wrong, it was an aggressive gerrymander, but the VRA made it so the 6th and 11th districts are winnable by Republicans when they otherwise wouldn't have been. Chicagoland wasn't even the most aggressive part of the Dem gerrymander, it was creating a 13th district that goes all the way from East St. Louis to Champaigne & a 17th district that goes from Bloomington to Rockford while picking up the bluest driftless area precincts.
A fair Oregon map would be 4-2. The 5-1 map is clearly drawn to overrepresent the Portland area; look at how OR-5 pulls from the southern Multnomah County precincts to dilute the rest of the district:
Yes, a fair MD map would be 6-2 and a fair NYC map would be 19-7 or even 18-8, but a fair Texas map would be 17-18 Biden won districts as well as several Trump won districts that were by much smaller margins and have the chance of flipping this decade; instead it only has 13 Biden won districts and only 2 more that Trump won by less than 12%.