THIS! I expect my luggage to have good wheels, sturdy fabric, sturdy zippers, sturdy handles, and hopefully not weigh a ton. A jack of all trades is a master of none. My current luggage is 10 years old. What technology products from 10 years ago are you still using today? The cassette deck in my 2004 car seemed somewhat dated in 2004. In 2014, it was completely useless.

I do 2 weeks away from home all the time with nothing more than a Costco/Kirkland carry-on and a laptop bag or my laptop shoved into my camera bag.

Depending on attire, I can usually do 7 days without a problem. Beyond that, or for heavy winter clothing, laundry will need to be done on the road. There are many threads about doing laundry on the road on FlyerTalk. You can buy laundry soap sheets if you're not sure what the laundry situation will be at your destination. I usually skip hotel laundry unless it's a self-serve affair (I still feel strange about having other people touch my dirty clothes), and in most major cities laundromats/laundrettes are common and cheap.