I think the crux of the issue is that you can land in the center of the fairway in a designed landing spot and have the kind of lie that is being discussed. That's not really comparable to being forced to pitch out because you made a bad tee shot. If you throw a shot deep enough in the rough that you have to pitch out away from the basket, that's on you. If the hole is designed so you have to throw away from the basket, the lie rules start to break down.
That's why LOP is already redefined on holes with mandos. Because the designed LOP is not straight to the basket.
The real question here, to me, is a course designer tool kit question. If you end up short of the corner, a mando prevents the higher risk, higher reward play of trying to cut off the corner. A designer may want to be able to create a tough corner to reach that rewards the longer shot, but still allows shorter shots options. That's hat was created for NW Black.
If a designer applied for an exemption, would it be possible to define a "mando" that required you go either to the left or the right of it? That would largely solve the LOP question, while still allowing the full freedom of shot selection. Although, given how LOP resolves with respects to mando lines that could be even more confusing to apply, even if the end result was better.
A "mando" that only affected LOP, applying no penalty if it was "missed", would likely be even better.