ACK! Every time I see your description of your 11" MBA, I kick myself for not having the foresight to get one maxed out like that.
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That must be an amazing device.
It is; and I love it.
Actually, my iTunes library alone is well over 100 GB, and - to me - it made sense to simply max it out, more power, more stability, more speed.
I went from a 2010 MBA - the so-called 'Rev C" - (which came with 2 GB RAM and 128 GB SSD) skipping a few iterations to 8 GB RAM and 512 GB SSD. I couldn't believe the difference. My first CTO was a 13' MBA - which was stunning (same configuration - 8 GB RAM, 512 GB SSD, and Core i7).
However, while awaiting the completion of the 13" CTO - as it is a special order, they can take several weeks and, as I was working abroad at the time - I bought - as a stop-gap, an Apple refurb, a 2012 11" MBA, with 256 GB & 8 GB Ram, just to see what it was like. As a middle aged woman who travels a lot for work, portability, reliability, power and speed were of major importance.
Anyway, I was smitten by the form factor of the 11" - but knew that the 13" was on order. A colleague was awestruck, and wished to buy it from me for his wife. So, I sold him that when I went home next on leave, collected my 13" CTO MBA, and, when that period abroad finished up, I treated myself to the 11" as a travelling computer.
A sibling inherited the 13" a few years later as a birthday present - which was still in stunning shape - I used it mainly as a desktop.