Why didn't MnDOT straighten the 35W curve in downtown Minneapolis?

The Minnesota Department of Transportation took four years to carry out a $240 million project to rebuild Interstate 35W between downtown Minneapolis and 43rd Street.

New concrete was put down to replace 50-year-old pavement. A new transit station was built at Lake Street. Nearly a dozen bridges were rebuilt or refurbished. Ramps were put in at 28th and Lake streets. Special lanes for carpools, motorcycles and buses were added, as was a new transit station in the center of the freeway at Lake Street.

And the biggest change came in the form of a rebuilt flyover bridge taking drivers from northbound I-35W to westbound Interstate 94. The new bridge now deposits drivers in their own lane on the left side of I-94. With the old ramp, motorists crossed over I-94 then entered on the right side of the freeway and were forced to merge into traffic.

https://www.startribune.com/why-didnt-mndot-straighten-the-35w-curve-in-downtown-minneapolis/600181455/