They have to walk more than before
Usually when a server begins their shift they are assigned a section in the restaurant to look after, but with the current restrictions they are only allowed to have outside seating. This means that every servers section is now outside the restaurant which means they will be doing a lot more running back and forth from the kitchen to your table. In addition to that, the outdoor seating doesn’t just appear by magic, they have to set all that up even before they have to run about serving customers.
They have to put up with a lot more abuse
There are some customers who if you served them their food on a gold plate resting on a silken cushion whilst being fanned by palm leaves they would still find something to complain about, such is the nature of the service industry. The sorts of people that have a tendency to complain have more fuel to throw on the proverbial fire with the restrictions being imposed because of the pandemic and they have a tendency to take out their frustration and anger out on the people serving them, people who are not responsible for making any decisions.