off cambers?

Agreed! Stop being worried so much about 'flow'. Disrupt the 'flow' and slow the tracks down.

I have seen them work good and bad. They had one on a 90 degree corner and there was an inside and outside line.

Then there was a horrible one that ended up just having one big rut going through the middle of it, which lead to single file racing in that section. If they do it right it can be very good.

Both of these were in recent years

In my opinion they work best when they have an outside line that allows you to double out of the corner and an inside line where they go tight and have a take off where the guys that went outside and doubled are landing. In my opinion they need to have more different rhythms opposed to where everyone is doing the exact same rhythm the entire track!

Indy had one... didn't work out for DW15 in the heat race first lap.

Yes I remember that. I do not recall that being the tracks fault. Cant remember the particulars.