It's probably useless information to everyone here now :-D but my Thinkpad Yoga 15 20DQ has been going strong for 11 years now, and still running a fully supported Windows 10 smoothly - best laptop I ever owned!
I've upgraded RAM on two occasions, replacing the HDD with an SSD (Sandisk Ultra II 960G) was the first thing I did, and that disk too has been flawless.
Yes, the base warps a bit if you hold the corner, but it hasn't proven to be an issue.
The hinges are rock-solid in my experience.
I see some wear on the power button (plastic has become brittle IMHO) and some bottom/base tray screws and screw holders are no longer tightening.
Anyway, I wanted to say that I hope my next laptop is as durable as this one has been :-)
Casually looking at a Yoga 7i 2-in-1 or a Thinkpad X9 (which is not convertible, but feather-light), but there is no urgency.