Don't. I also chose the Air 3 and despite all the bashing, and the heavy pro-Pro opinion in this thread, I've decided not to change it, for pretty much the same reasons as you. I'm happy with it. It fulfils all my needs. I won't change it for a device that looks better on some specs but is older and where a probability exists it might get hit by a screen issue which is perhaps why Apple pulled the plug on this model after only one year. Like we say in German, it's better to have a sparrow sitting on your hand than a dove on the roof.I appreciate every comment, unfortunately all it does is fog my brain. I know the Pro 10.5 has better speakers, a better camera, a better GPU and more Ram, I just can’t get past the fear of getting a bright spot and the fact that the Pro 10.5 might lose iOS updates two years earlier than the Air.
I just wish the Air had a bit of love. Everything seems so biased against it. I feel like a fool liking it.
Besides, if you step outside the MacRumors / anglophone galaxy, you'll see that this Air 3 does indeed get more love. It's a great device. Also, my impression is that people who bash the Air 3 are 10.5 Pro users who have never really tried out the Air 3 the way you have, by using both devices side-by-side for a couple of days. You are entitled to your opinion and your choice, and if the Air 3 suits you, and you're happy with it, keep it.