Adobe has been, and probably will always be, one of the worst software development companies in existence. It is only within the last 5 years or so that they have become even remotely competent. I do believe all decent programs they have ever published (think Photoshop) have been bought from another company and rebranded under the Adobe 'seal of death'.
Prior to that Adobe's business was based on PostScript, and they developed Illustrator to take advantage of PostScript's capabilities. Then they licensed Photoshop.
