[Samis2001]

In the case of houses, I would think in most cases there's less conflict between prettiness and efficiency, for things like furniture there's much less space for the aesthetics to make a given piece more or less functional or efficient. However the tension isn't entirely gone, Juicero and 'McMansions' spring to mind as possible counterexamples.

[alerighi]

I don't think paragonating email clients to houses makes all that much sense. Unless you use them for personal stuff (but most people use mobile phones or webmails for that these days, that to manage 1 personal account it's fine) email clients are a professional tool, used at work.

So it's more correct paragonating them to a factory, where furniture doesn't need to look good but it needs to be functional, safe and reliable.