is PS very important?
well lets put it another way: in film photography, do you agree the darkroom is very important?
also in film photography you can take the pics and send it to a lab and take whatever the lab does for you - for good or bad. correspondingly for digital you snap and leave the processing to the camera processor (onboard or off board) - again for good or bad.
its really up to you to have full control or not. Again it can be a good or a bad thing - it depends in part what you do when you have control, and whether you know how to control, etc. But it is also certain in film it was prohibitively expensive to have full control.
You can still think as in film days, and instead of arguing over Fuji or Kodak film, you argue, swear and fight over which camera has a better algorithms (or more likely just camera brands as algorithms are mysterious unfathomable black boxes for most, just as film chemistry was and is).
Or you can put on a new thinking paradigm - namely the freedom and total control that digital gives you - and instead of arguing over algorithms - or camera brands - learn to use, harness, exploit, develop new ways of making pcitures, even those impossible in traditional photography, and redefining photography in the process, and unleash your creativity in ways novel, provocative and exciting, and never ever posssible. And then you shoot - and process - in a manner most appropriate for your style, experiments, aptitudes, etc.
So really its your choice.