In death of the desktop, interface expert Aza Raskin mentioned that his computer has seven copies of the spellcheck program with seven slightly different implementations of the English language. Building a user interface based upon command sharing rather then bloated applications will ultimately benefit end users.
Now as to the manner of creation: you're reacting against the "just hack it together" philosophy of ghc. But the alternative in ghc's mind, I think, was people not creating anything for fear of not getting it right, or not knowing that building something for themselves is even a possibility. Sub-optimal creation is usually better than nothing, especially when nobody else has to use it.
Fitting stuff together is hard, especially now when we don't have good protocols. While we're working on those, telling people who just need to get stuff done to "wait until we figure some stuff out" is not acceptable. Those people (who may not even be "Programmers") and their products will still benefit from "fitting things together" to some degree that depends on the application (OS or fart app?), but that needs to be balanced against the need to actually finish at some point, all of which is in the service of some non-software need. They just need to get it done with whatever works, whether it's Haskell, PHP, or a spreadsheet. That, I think, is the point ghc was getting at.
If everybody uses whatever framework without concern for compatibility it will inevitably lead to enormous bloat. I have no problem with getting things done quickly to fulfill non-software needs. However, when it comes to software one of our most important needs is to reduce bloat by encouraging sharing.