It's easier to control soil moisture and raised beds do drain better as the soil is already loosened up.
Better control of soil conditions. One will not continuously have to add pricey soils and amendments, only to watch them sink into the ground or get washed away.
The local ground may be unsuitable for achieving good growth, or the land could even be toxic or unhealthy. Raised beds provide you with the right soil at the proper depth, as well as confining the moisture to the right area. You know and can control what is in your soil
The extra height is easier on the back.
There is no need to till, no need to hoe, and much less weeding.
Containers warm up faster, which is an advantage.
No problems with moles provided some chicken wire is laid down first before filling up a bottomless raised bed.
Elevated planters eliminate problems with dogs and rabbits.