There's a work around if you want to upgrade your macOS on your Air.
https://www.intego.com/mac-security-blog/how-to-keep-older-macs-secure-a-geeky-approach/
This is only true if you want your software in Apple's Mac App Store. You can still download anything off any random site, including Applications. This is actually how a lot of people get malware on their Macs.
I’m pretty sure he already has a mk7 with 98,000 km on it.
I would check YouTube for some comparison videos. The mk8 is built off the mk7 but will have updated tech and will obviously look a little different.
Go with something like this: https://www.harborfreight.com/15-ton-aluminum-rapid-pump-racing-floor-jack-64545.html
Much more leverage and a better lift pad. They go on sale pretty often too.
I have an airport extreme. Definitely the best router I've ever had. Never had an issue with it , and it's super easy to set up. Also the range is very good. Sure it's more expensive, but you get what you pay for. Sure it's not a "$20" router, but I don't have to worry about replacing it or...