If it helps, the M4 13 + MKB is almost identical in weight and thickness to the 13” MBA. Comparing the 11” to the 13” both with the MKB, the 11” feels marginally lighter. I believe it’s 2.2 lbs vs 2.7 lbs. The 0.5 lbs difference certainly feels less substantially than it looks on paper.
My guess is that if you are wanting the MBA for better balance, the extra weight won’t really bother you.
The issue with the 13” isn’t the weight, it’s that it’s unwieldy as a tablet.
- can’t fit in a small sling bag
- can’t fit in tablet pockets of backpacks, must go in the laptop pocket
- can’t be used for extended periods one handed
- barely fits on economy class plane trays and can’t fit alongside a meal in business
13 is good if you are a large individual, need a laptop sized replacement, hard of sight or intend to use it more stationary (ie not going to whip it out on a plane, train, bus).
13 is an amazing device but it’s closer to a laptop size.