Why have Mrs Hudson trying to carry on an affair with the guy from the deli?
Why have Sherlock eat from Mrs Hudson's fridge at will?
Why does Sherlock wear a scarf & coat?
It's just something to round out the character. In most scenes nearly everything you see is a specific prop, someone has decided what goes in the scene and what goes. The ring, the shoes people wear , etc would all be no different.
Funnily enough it does spark conversations in another area but I will leave that alone.
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Also, please note that sentences can also end in full stops. The exclamation mark can be overused.
Sherlock Holmes 28 March 13:08
Mycroft’s popularity doesn’t surprise me at all. He is, after all, incredibly beautiful, clever and well-dressed. And beautiful. Did I mention that?
--Mark Gatiss
"I know that you believe you understand what you think I said, but I’m not sure you realize that what you heard is not what I meant."
Robert McCloskey