It's not a 'bit of a daft statement' at all. Firstly I presented it as my opinion rather than a statement of fact, and secondly ingenious solutions to otherwise simple electrical jobs are what DIYers tend to do. There's no need to leave the next electrician scratching his head trying to figure out what's been lashed together because the previous installer fancied being a bit different, eg why would you use plumbing pipe when there is a perfectly good solution available?
You might be able to run the pipes around the property, you might be able to get them to fit in the boxes, but how do you add inspection bends in accordance with the regs? Would you try making your own couplers, or solder the ends together like a plumber?
Then you've got the problems associated with having done something nobody's expecting, like when it comes to altering a circuit - the electrician will be looking for something which looks like electrical wiring, not plumbing. Likewise if the central heating needs replacing and the plumber tells his apprentice to 'rip out all the pipework'.
So I do think it's better to install circuits 'by the book' - letting your imagination run wild seems to be asking for trouble.