7kgs + Personal Bag is easily doable if you aren't going to be using one of them 5kg roller bags. These days I've taken to carrying a light weight 30L duffel bag for my clothes and then a small backpack for the computer, external monitor, powerpacks, cables, charges, headphones. Works fine for a few nights away.
If the airline started charging for carry-on bags, then it'd be a function of the price versus time to check-in and wait for said bags, which is on a per trip basis - direct airport to office, then I'd want time, airport to hotel the night before work - I'd be happy to wait.