£2000 longevity versus £150 longevity VFM?
Attempting to compare a brand new high end laptop to a heavily (ab)used ex corporate low to mid tier machine is quite ludicrous.
A brand new MacBook Air is £1000. You've got to go to the MB Pro, either 14" with M4 Pro chip, or 16" to hit 2k.
But a brand new Macbook can be reliably expected to get 10 years use on a supported OS. 6-7 years of feature updates and another 3 of security updates. Apple provide service and parts for 5 years minimum after a laptop is last sold.
For a slightly more realistic comparison you can get a Macbook Air M1 13.3" refurbed for around £300 if you shop around. Yes it's double that price (which is probably a loss leader anyway, they probably want shut of the stock), but a far superior machine.
Intel i5 8th gen is the last cpu supported by Windows 11. Will it still be supported for the next version? Who knows. The performance of the M1 will frankly pee all over it, and do so in total silence as it's fanless.
The Latitude's screen is a low end 1366x768 resolution. M1's retina screen is 2560x1600 pixels and looks luscious.
Lastly the experience of using them is just soo much nicer.