Thinking about replacing my ageing Macbook Air 11" 2013 Options are naturally current model MBAir/MBPro 13" or previous model MBAir/MBPro 13" via the Refurbish/Clearance store. Curveball is a Macbook 12" 2017 i5/512GB ... Clearly the Macbook 12" (i5) is exponentially faster than my 11" Air and has (+) Much larger SSD, much faster SSD interface, better battery life, better screen and is generally lighter and brighter, but (-) more fraglie, butterfly keyboard, USB-3 Gen 3.1 (slow) port x1 (needs an Apple HDMI+USB-A+Charger adapter for £70 to offset). On compromise points, the Macbook 12" (i5) keyboard is Gen2 plus the laptop doesn't have a fan sucking dust into the keyboard mechanism (hence why almost no-one complains about knackered MB12" keyboards?). Macbook 12" 2017 i5/512GB has a street-price here of £999 making it affordable too. I could mitigate a lot of weaknesses with a new 2017 (old) Macbook Air 13" that has, relative to my current MBA 11", faster processor, faster SSD interface, better external monitor support and an SDXC port for cheap storage upgrade (JetDrive Lite 130, etc). Plus the 2017 MBA 13" is more robust. Additionally I can replace the battery on an old MBA, and upgrade the SSD myself later if I need to; modern laptops are end-of-life/costly service once the battery/SSD fails. Applecare is 25% cheaper too. As a general rule Apple makes products Vintage at 6 years so both Macbook 2017 and MBAir 2017 will go end-of-life in 2024/5 as will anything I buy now from the refurb' store (given I'm 63 now I'll be three-score and ten by then myself!!). My MBA 11" will go Vintage next year. This will degrade access to macOS upgrades and software application upgrades/security from that point forward. I feel a change is neccessary but have to say; in no way does the performance of my MBA 11" impact the writing and accounting work I do - it's fine (best laptop I ever owned, etc, etc). Thoughts?