I find it funny how people seem to fixate so much on the fact that the author upgraded various components to say the title is misleading. As someone with apparently similar requirements, the take-away from this should be this: Even though significant work is required to keep these old machines working, some people prefer to do so. Crucially, they prefer it not because they love tinkering, but simply because the value…
The business Dell laptops blow anything lenovo has ever made out of the water in terms of specs, build quality, and serviceability. Also Dell’s bios is way better and easier to do stuff in. I’ve had a t420 and I thought it was crap compared to the Dell business laptops. The cooling, plastic casing material, and serviceability just isn’t there. On the T420 my palm rest cracked and to replace it you pretty much had to fully take apart the laptop to get it off. ifixit rated that particular repair at a pretty high difficulty, so instead I took the reusable components out, binned it, and used a Dell latitude.
Currently I don't own a Dell business laptop however. Right now I'm using an Intel NUC Laptop and it does pretty good.