Might just be a matter of context and without the context we get the zealotry. Biggest mistake everyone makes when saying "XYZ is teh lames" or "teh wins" is not describing their context.

Our OS team works differently from our apps team for example, because if something in their stuff breaks it's a big deal, they also really worry about backwards compatability and whenever I touch their code I have to create an IPrinter34 to not break things for old clients (who still want their IPrinter12).

In our apps team though we keep things cleaner and kick out the IPrinter23 and keep things as IPrinter so people can read the code more clearly. Backwards compatability isn't so much an issue for us (apart from obviously considering updates) as we release 1 single unit that replaces all our files. If somebody has an old OS then its not supposed to work anyway so the app going titsup is the correct outcome.

Therefore I don't have an opinion on this subject either way, in some scenarios you do IPrinter34 and in others IPrinter.

When people talk with strong opinions on code they should probably start by announcing their own applications of it.