You're right. Food processors and blenders are different animals. You can't chop or slice with a blender. But if it's a purée you're looking for, the blender will do a better job.
I find, for example, that while you can make pesto in either a processor or blender, the blender's finished product is superior. Either will work for making mayo, but I'd instinctively use the blender.
But only the processor will quickly chop up onions and celery for stuffing.
My processor is fairly basic. It has about five specialty discs for slicing and other stuff, but I rarely use them, except for the slicer. Perhaps I should fool around with it more.
In some ways, though, over the years both have been simplified. Back in the 70s, both processors and blenders had a million different buttons on the base, regulating speed and power, supposedly. They were basically useless. Nowadays, the buttons have been reduced essentially to "on" and "off". Since you can simply pulse them, that makes sense.
