This is a gross oversimplification, especially washing in a family (> 1 person).
1. Sorting - when you buy clothing, do you take handling instructions into account? Accounting for handling is very hard! Good luck shopping online, hunting through instruction tags hidden on sides of clothes, all while keeping price reasonable. I do not like shopping, so I choose the first thing that looks ok and is comfortable - I am often left with unpleasant surprises when laundering. Some dryclean only, some handwash-only, some fine with washing but no dryer, some with dryer ok but tumble-dry only.
2. Do you have an in-unit washer? I do not - I traverse 7 flights of stairs to communal apartment laundry room.
3. Do you need to use quarters for the machine? If yes, this takes an extra trip to bank beforehand.
4. 7 flights of stairs again to transfer some of the clothes to a dryer, others ...
5. ... Need to be line-dried and hung, somewhere.
6. Finally, the clothes that could be normally washed must be folded and put away, not stuffed into a drawer (even simple t-shirts get wrinkled this way).
"washing" is not just pressing a button.