I've only ever had second hand ThinkPad T series laptops and a brand new 2015 MBP. The MBP had by far the most hardware issues of any devices I ever had (second screen only on power, running hot enough to cook on it, battery life was mediocre from the start, ...). Every single ThinkPad I ever owned is still ready in my drawer. My ~15yo T420 still has like 6 hours battery life and works like a charm
The build quality thing is only true if you compare them with cheaper laptops. In the same price class you find more interesting devices IMO
True of older ThinkPads but Lenovo seems to have finally broken them. My current T14s Gen 3 AMD has modern standby problems. Fails to resume from sleep about once a week. Trying to get Lenovo to do something about it.
Windows. I haven't tried installing Linux yet because I wanted to make sure it works with the factory OS first. Other people have issues with GPU drivers in Linux. There's also the issue of the removal of the S3 sleep option in the uefi.
The build quality thing is only true if you compare them with cheaper laptops. In the same price class you find more interesting devices IMO