Sorry, but it's not like arguing you can use "Gimp rather than Photoshop" at all. You just identified a specialist application that's used in a specific use-ca

Sorry, but it's not like arguing you can use "Gimp rather than Photoshop" at all. You just identified a specialist application that's used in a specific use-case by a limited user-base who fully use the capabilities of the software. When a designer uses those tools their productivity is significantly increased or limited by the software. The focus of the role is using the computer as a tool, so if it performs poorly so do they. Most 'general office' users, and certainly many administrators don't fully use the capabilities of the software they have because it's not the focus of their jobs. The software isn't the limiting factor in them doing the job. Take the example of someone working in job centre or similar, they'll likely use a Word processor for providing letters, e-mail for external/internal interaction and some custom internal applications (e.g. the jobs database). There are all well within the capabilities of Open Source software. Framing it that way would certainly be an argument against replacing Photoshop for Gimp; but it doesn't tell you anything useful about replacing general Windows/MS Office with Linux and Open Source.