Travelling light isn't only a budget concern. Even when checked luggage and porters are affordable, light travel produces calmer trips: faster transitions, less stress about belongings, more flexibility about itineraries.
What 'light' actually means
Carry-on only for trips up to 2 weeks. One main bag plus personal item. Fits overhead anywhere. Doesn't require bag transfer logistics at hotels.
Trying light travel once usually converts people. The advantages compound across the trip; the 'I might need it' anxiety about leaving things behind rarely materialises into actual problems.