They can be if you are really good at reading repeating chart patterns, but the raw Renko bars are not good for that. Pull up a snapshot of a NQ, YM, CL or GC chart with a few hours in it, and we can compare them to those that I have, see which might be easier to read.
It's like being in the middle of a battlefield without a bulletproof vest and without a helmet. It is suicidal.
Sometimes I will look for mushrooms and get into places where there are many brambles. I just want to get out of there.