I only did custom home residential work, so I never followed the minimum rules. I will typically start with a receptacle near the door in a bedroom, not 6 feet in. This puts the receptacle where a vacuum can be plugged in, and then space the remaining receptacles thinking of how the furniture will be placed. Only those "I never want to see those awful looking receptacles and wires" people are disappointed. All the others love the idea of being able to plug lamps, computers, etc. in without moving furniture.
I actually had a receptacle added behind the couch. The spacing worked out so that the lamps on the end tables both reached just fine.
That way the 'more accessible' receptacle near the end tables are unused so that I can plug in transient loads...like my laptop.
On a more humorous note: When my nephew was having his first house built he remembered that I had been talking about the 6' rule. After construction I asked him why there were so many receptacles in his new house and he told me that he "took my advice about the 6' rule" and had the EC put receptacles on 6' spacing everywhere 'like I had said'...so there ended up being twice as many outlets as needed almost everywhere. I calmly explained that wasn't what the 6' rule was, but the work was already done. I thought that experience would make him more receptive to actually listening...but alas. LMAO
From the new stores I have been in, in my city the Canadian doughnut chain (Tim Horton's)is putting a USB combo receptacle at most of seating locations in all the new stores.
Its actually interesting to see how many customers (mostly teens but some business people) are using the USB ports and how quickly they move from the few non equipped tables in the middle of the floor to a booth or wall table with one.
You will have to second guess where people are going to park their mobile devices. My wife does not take her cell phone into the bedroom. My POTS phone in there is pretty much out going calls only (no bell)
It's not just about the cell phones. All manner of things are now using the USB ports.
Sure, there are the "obvious" things like phones and tablets.
Then there are bluetooth speakers, cameras, and other electronic toys.
Last, there's the "woot" market. "I Want One Of Those." Little USB lights, fans, lava lamps, disco balls, even a coffee cup warmer. Name it, and someone is likely to make it.
I have a USB 'hub' with seven ports in it. Those seven ports take up about as much space as a duplex receptacle. Remember the older receptacles that had three plug ports? Well, here comes seven!
Let's face it ... 15 amps is an arbitrary figure. It's not really enough for a 'real' load, like a space heater or microwave ..... yet far more than what you need for most loads. Even a traditional light bulb used less than one amp.
Maybe it makes sense to have plenty of limited outlets for all those tiny 5-watt loads. That's the USB limitation: 5 watts. Without a USB port, you need to plug in a 'wall wart,' and one of those will block an entire duplex receptacle.