In North America/Europe most travelers assume that weight/size of carry-on is not a determining factor. As a result way more options exist to rely only on carry-on solution.
Whole different situation is in the rest of the world and especially when budget airlines are involved. Here in south-east asia airlines do both weight your carry-on and fit it in their sizers, which BTW is smaller than sizers I've seen in US.
So, there is quite a difference when one can have 20kg bag in the carry on (US) vs 7kg (in Asia). However, despite this fact, I've managed on all my business trips regardless of the length (3-30 days) have carry-on only.
Yes, it does involve max 3-4 set of clothing/underwear which are washed in sink (according to the travel policy, cleaning fees are expendable only when trip is more than 10 business days), but I do not mind - I was doing my own laundry since I was 12 (thank you mom!)