Many years ago, there were only manual ways to wash dishes
A dishwasher provides a way to get dishes clean without spending the time washing them. For people who have a busy lifestyle, this equates out to less time spent in the kitchen standing at the sink washing dishes because the dishwasher does the job. Dishes can be scraped or lightly rinsed to remove excess food and placed in the dishwasher. This takes a fraction of the time that is spent washing dishes by hand.
Every dishwasher is capable of cleaning your dishes at a hotter temperature than your hands can stand, even if you wear gloves. This means that your dishes are being cleaned and sterilized as the hotter water kills more germs. In newer models, your dishwasher can not only provide hotter water but a sensor and filters allow for recycling, which cuts costs on your water bill.
For individuals who have troubles with the dexterity in their fingers and hands, it may be difficult and challenging to wash dishes by hand. Using a dishwasher gives hands the break they need when problems arise with fingers such as arthritis or other disabilities that may limit the flexible movement in your fingers.
Dishes are dried by the dishwasher as well. Dishtowels are not needed and don't require extensive drying such as you have to do when dishes are manually dried. The air drying function also provides additional sterilization to your dishes since they will be completely dry before you put them away in the cabinet.
Some people prefer to have as much counter space visible in their kitchen as possible. To them, dish racks are unsightly and undesirable on the countertop. A dishwasher eliminates the need for a dish rack, dish drain, silverware holder and all of the other items associated with needing a place for dishes to sit and drain after they are washed by hand.
The final decision on having a dishwasher is up to the kitchen user and the degree of practicality that is determined. The advantages of using a dishwasher do tend to outweigh not owning and using one. Although there is an initial expense to purchasing a dishwasher, the time saved by letting the dishwasher do the dishes can add up over the long run by providing a higher quality of life with more time to relax instead of standing over a hot sink full of suds and scrubbing out pots and pans.
If you are halting between using a dishwasher and doing the work yourself, make a list of some things you currently don't have time to do and compare it to see if you want to free up the time to enjoy those things.