Doing laundry is a lot more than loading and unloading. If you have small children then you have to check everywhere for stains and apply something like Spray 'n Wash first. And then folding takes a lot of time. (There is a folding machine launching soon but it's expensive and might not be reliable https://www.foldimate.com/ .)
I've tried a couple of different Roombas. They simply don't work very well. The rollers get tangled on rug fringes. They get stuck under furniture. The suction is weak. They require frequent cleaning. In the end it's less hassle just to use a regular vacuum.