Yes I know what RAW is
Hmm doesnt sound like you do to be honest, but maybe Im misunderstanding you in which case the following is for others who dont understand RAW.
When you take a photo, a camera comes up with a RAW image. Whether you have selected to shoot RAW or Jpeg determines what the camera does next.
If you have selected Jpeg the camera then adds things like sharpening and contrast for you and then deletes the original RAW file. This photo is then ready to print
straight out of camera. If shooing Jpeg and the camera adds too much sharpening for a particular photo, you are pretty much stuck and theres not much you can do.
If you have selected RAW, then this means that the camera will leave the photo in the state that it is in, ie it doesnt apply any picture controls or sharpening. Then it is up to you to add things like sharpening and contrast in post production to your personal taste. RAW photos are not ready to print
straight out of camera and sharpening etc must be added in post production.
So If DSLR is that great how come you cant get the same result without photoshop
In this case, you are shooting RAW, so the photo looks flat and dull as there is not contrast or saturation added, this must be done in photoshop or similar.
With my 70-300mm lens i still need more sharpness sometimes
Actually you probably need more sharpness all the time because if you are shooting RAW, the camera adds nothing
Hope Ive helped,