Can't talk for David of course but I have the exact same laptop, which is not my main machine, but I installed Logic on it and it's working great no issues. I can load up the Beck demo song and it will play through without any problems. It's a project with no heavy third-party plugins but it plays without hiccups.
I rarely use it but I realized that every time I needed to have a laptop because I had to record something outside my little studio, the tool required to do the job wasn't a powerful laptop. But for a lot of people it would probably not be enough. But if you only need a portable recorder and you'll bring it back to the studio for editing and mixing, that little MBA is more than enough. And I paid 350$CAD(around 260$USD) used for it. Small and featherlight, 12-hour battery and a great trackpad is all I need when I'm outside the studio.
iMac 27"i5 24Gb ram, macOS10.14.6, LPX10.4.8, PT 2019.10 Nat., UA Arrow, UAD-2 Sat. Quad, LaCie SSD, Genelec 8040A, Korg Z1ex, DSI MophoDT, Korg KLC 2007& DE, Komplete 12, Omnisphere 1.5, Arturia MoogModular, Cakewalk Rapture Pro, LesPaul, Stratocaster & Telecaster.