Fellow lover of the 2013 air. I maxed it out on everything but storage when I bought it (core i7, 8 GB ram) and I'm glad I did, since a computer I planned to own for a couple years and then swap upwards has put in 7 years of hard labour. The battery capacity is down to 70% (plus in the last couple months shuts down below 50% when it's cold) and I'm on my third charger due to cable fray, but this remains the best computer I have ever owned. When the retina macbook pro arrived in 2015 I assumed it wouldn't be too long before high res screens trickled down to the whole lineup. I'm not sure I've ever been more wrong about product direction. I have been waiting for years for Apple to release something that hit the size, performance, versatility, and value I have gotten from my air.
I was tempted by the 2016 macbook pro non-touch bar, but it was so expensive for what you got I just couldn't justify replacing my air.
I was incredibly disappointed by the 2019 retina air. Finally a retina display the air had been needing for years, but the performance wasn't great. That would be forgivable, but the price was just too high (plus the keyboard they saddled it with really didn't seem pleasant to type on).
This time they seem to have gotten the 2013 air recipe right. I wouldn't turn down a couple USB-A ports to avoid dongle hell, but otherwise this seems as close to the 2013 successor we're going to get. I have an order in for the 2020 air with the core i5 upgrade and in case it winds up needing to serve another 7 years I got 16 gb of ram. We'll see if I miss my air enough to return it and switch back or not.
I'm really hoping apple announces arm macs in the next year or 2 as I'd love to have the ipad pro guts inside a roughly air sized form factor. I use the console and other general purpose computing things far, far too much to make the leap entirely to iOS, but mac os running on the ipad pro would be a great spiritual successor to the macbook air line.