alt Hacker NewsMaybe mapping is very useful to you. The lack of it hasn't bothered me in the slightest. You also don't need mapping (or internet access) for obstacle detection. But I find that the old dumb roomba's bumpy nature is a good motivator to keep my place somewhat free of obstacles, which has other benefits.
YMMV.
I like being able to tap my phone a couple times and tell it to clean out e.g. the area around my cat's toilet, or my kitchen floor after I spill something, etc...