OP
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Because it's silly and wasteful.
I can understand deliberately running a spare core, but it smacks of a lack of understanding for two conductors serving the same function to be run like that. I would have run a twin brown and a single brown. That's all that's needed.
I don't mean to patronise but you do realise this is the DIY section, right? I think there's a separate section for you to discuss your ideas for best practice with fellow professional electricians.
What I've done isn't technically wrong and your nitpicking isn't of any value - your first post didn't address my original question and neither has your last post. You're just making pointless observations after the fact, instead of offering solutions.
Since you raised it anyway (and again, this is a DIY area), you should be saying that people who have limited-scope wiring projects to do (i.e. those who are not trade electricians) should just buy a reel of 1.5mm blue-brown T&E and a length of brown sleeving for Switched Line wires. That would be much more sensible and resourceful than doing what you'd do, for the vast majority of DIY electrical projects.