Well, why not? Let's discuss. After all, it's

• much easier than moving stuff from purse to purse
• no babysitting that bag everyday
• better than leaving tissues or chapstick+ in clothes that then accidentally go through the wash
• simple to know where my ID/cards are all the time
• perfect to avoid pickpockets 

Plus, I don't have to overthink every morning so I can be efficient with my time.
So in the grand scheme of things, there's really no reason not to do it this way.

What about you? What's your excuse...?

;)