A better vehicle analogy would be to say that you wanted a passenger car for road trips and bought a Honda Civic designed without a radiator. Then being told that it could only be used for short trips, met it’s design objectives, and that you bought the wrong car. Sure, you made the wrong purchase decision. But, one would also argue that the design was inadequate for market.
Or maybe a better vehicle analogy is that you bought a Honda Civic and then wondered why you couldn't red-line the sucker for hours on end at Le Mans.
"How long can it turbo-boost before throttling" is not a question asked by someone who wants an affordable car that can cruise the Interstate at steady highway speeds with decent fuel economy. You need to punch it for a few seconds to get past an 18-wheeler? Yeah, the "Civic" can do that just fine, too.
The thing is, I've had two Civics. Damn fine vehicles. They've done everything that I ask of them; long road trips, zip up steep hills like the one I live on... When I need to pass or make it to highway speed from a standing start in a short distance? I can punch it and it jumps. However, my overall driving style is pretty much plain-vanilla, so I don't have to spend more than Civic prices to get a car that suits my needs. If I wanted "exhilaration" I might think in terms of other nameplates including Honda's own Acura line, which literally uses "exhilaration" as its current marketing catch-word.
Same thing for my computing style. Oh, once upon a time I worked on large book manuscripts that required simultaneous use of Adobe InDesign, Aperture, Numbers, Pages, Google Earth, and about 50 or so open Safari tabs... it required plenty of RAM, but never over-taxed the duo-core i5 in my iMac. Why? Someone else on the team was doing the really heavy lifting - outputting the pre-press PDFs of those 300-400 page complex manuscripts on a Cheese Grater.
That was a sustained grind that took hours. These days, no more InDesign, but I still often run photo editing, spreadsheets, and heavy browser and map research simultaneously. Memory pressure on that same iMac is now running far cooler, and the CPU is still chugging along at low levels of utilization. About the only time I hear the fan kick in is during an OS install.
If I wanted/needed a laptop (which I don't - I've used iPad as my portable since the first-gen iPad was introduced), MacBook Pro would undoubtedly be over-kill. Just don't need it, don't need to spend the money. MBA is as much as I need, and it's smaller and lighter as well. I felt differently back when MBA lacked a Retina display, but now that Air has that, I have no reservations about using Apple's "value proposition."
But a much longer time ago, I was in music recording/production. Pro-quality digital audio had just come to Mac, and I was running on a heavily-tricked-out Quadra 950. I recorded concerts live to DAT, then returned to the studio for post and CD pre-mastering on the Mac. The DATs had to transfer real-time to the Mac, which was a bit of a production bottleneck. Even then, I dreamed of the day when I could record direct-to-laptop and start post-production while still out in the field.
Today, that dream is fully realized, but there is no way on Earth I'd think to run Logic Pro X on a MBA in a pro environment. Even if MBA is fully capable (as a prominent Logic Pro X review in App Store claims), it's just the wrong place to scrimp, especially when you compare the price of a MBP to, say, a Nagra ($9,900 USD) or just a single Neumann U-87 mic ($3,200 USD). Now, Neumanns were a bit cheaper in the '90s, but I often went into the field with $20K worth of mics and a total kit worth over $50k (and that was considered low-budget, as I didn't use a sound truck). Hell, my studio monitors cost over $10k. The Sony CD burner was over $3k and the CD-R blanks cost $24 each (that was still cheap, since a 2,500-foot reel of 0.25" analog mastering tape cost far more, and 2" tape for a 24-track... I think we charged our clients $250/reel, which at 30 inches-per-second lasted 15 minutes). When I was doing film/tv scores a single-track 35mm mag film recorder cost over $10k... and the machine rooms in film mix houses had dozens of those suckers all synced-up. So, say $200k-$300k worth of machines, a $50k-$150K mixing board... all replaced by a $200 app running on on a $999 - $3K laptop. (Of course, people with my point of view are why Apple can sell $24,000 Mac Pros...).
Again, you can wish MBA performed like a MBP and that a MBP could blow a gaming machine out of the water, but that's not the way it is. If a Windows machine does what you want at a price you like, then why are you complaining here? But if you'd still prefer a Mac, then Apple has all the power - they'll price their equipment higher because they
can.