I love my MBA 8/8 16 512 so I'll be keeping it. Had a mini wobble 3 weeks ago when it built up some heat and battery drain went into overdrive, but after identifying Emulsion as the culprit and removing it, it's been absolutely spot on.
Am intrigued to see how AS evolves over the next 12 months and may well chop mine in if a better machine comes along for equality good VFM.
EDIT: 12 months ago I was trialling a 16" i9 32 1Tb that cost something like £3250. It was a powerhouse but it was big, sometimes noisy, occasionally hot and always eating battery life. I could have lived with those things had Parallels > Win 10 worked flawlessly. But it didn't. And the price tag was too high to justify so it went back. No regrets. I just decided to be patient and no way would I have thought a next get MBA would grant me a better experience for less than half the money. Bonkers.