What is bad with using the wrong cable housing?

Question

Thanks to Nate W's answer here, I know that there are different cable housings for brake and shifter cables. Assuming the cables match the housing diameter...

What would happen if I used the spirally-supported housing for a shifter cable?

Maybe answered by Would using compressionless brake housing for derailleur be a problem?

What would happen if I used the lengthwise-supported housing for a brake cable?

birthofearth · Accepted Answer

spiraled brake housing would compress when shifting which would diminish the accuracy and using lengthwise cables for brakes can't handle the stress and split wherever the tension is too great.
this article explains as much: https://www.pinkbike.com/news/To-The-Point-Shift-Cables-2013.html

Criggie · Answer

The opposite case, using lengthwise-braced shifter cable for a brake:

The brake inner cable probably won't fit through the shifter outer housing, because its slightly thicker than a gear cable.
Brakes might feel harsher because there's no shock absorbing from the housing's spiral.
The gear outer cable would be a loose fit into levers and calipers, permitting the ingress of more water/dirt.
Also, a smaller cable outer will move around inside a socket more than a good fitting outer, letting it mush the ends a bit more.

What is bad with using the wrong cable housing?

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