Better soft body/cloth deform/collisions...; implement: IPC, Intersection- and Inversion-free Large Deformation Dynamics

Incremental Potential Contact. Please watch their Sigraph 2020 video: youtube.com/watch

ipc-sim.github.io/

github.com/ipc-sim/IPC

One of the creators, and the youtube video poster, liked the comment suggesting implementing in Blender. Their MIT opensource reference implementation is dependent on suitesparse... Not sure how much work this would be, but it could be incredibly useful as part of Blender.