And you also need rice/potato with it unless you go keto in which case you need much more cleaning/slicing mushrooms and more meat.
FWIW, in my ~10 year professional cooking career I think I've washed a batch of mushrooms a grand total of 2 times, only because they were uncommonly dirty. You've probably eaten unwashed mushrooms many times in restaurants. Eating a little dirt probably isn't going to hurt you. If there's anything pathogenic on them a rinse in water isn't going to do much.
I should mention that the mushrooms are always cooked well.
Rice can be put in a cooker and prepared ahead of time. Some cookers even let you specify a time in the future when it should be ready. Similarly, marinading develops a lot of flavor over time that you could be doing work or errands.