As for timin chains, when I was young I though it was the best thing in the world. Now that I am older and that YT exists and you can watch countless car related channels were pro mechacnis tell you about their daily work in the shop... I realise that's it's the other way around. There is an endless supply of timing chain problem, especially on mrefcent/modern/fancY/expensive German cars but also Ford.. whereas the number of timing belts snapping if not abuse and replaced according to maintenance schedule is... well enver heard of any. Has to exist if just to satisfiy statistics, but has to be in the ppm range compared to timing chain problems.
To be honest it appears most timing chain problems are due not to the chain itself, but to a very poor design of the chain GUIDE, made of plastic that disintegrates over time, which then leads to a floopt chain and goes haywire from there. Planned obsolescence to me but that's the modern world for you.
Had a timing belt snap in September 2013 at 350.000 kms on my 1995 Renault 21 TurboDiesel, but it was because the belt had never been changed due to being skint at the time, and car was cheap and rusty so would not have been worth the money anyway. So chose to drive it until it broke. So well, it of course eventually broke, on the motorway.
So I would say this is a testament to how durable and abuse-proof belts are !
Which leads me to my other and last comment on engines... it's not all black and white, either interference or non-(interference engine, as to will the engine survive or not !
GOOD DESIGN can also enter the mix and blurr the line !
See : when the belt snapped on my engine, the engine did survive just fine ! .. because, Renault did something clever (every once in a while it can happen). What they did is design the engine so that the belt snaps and the pistons kiss the valves, the rocker arms driving the valves will act as the weak link, as a fuse : they will snap right off, before the valve starts bending. So all I had to do was get a new rockers, which cost 30 Euros for a complete assembly at the junk yard, takes 5 minutes to replace, then put a new belt on and off you go ! Engine started on the button and ran smooth as a kitty ever since. Kept the car until 2018 and 450.000kmls. Was too rusty and would not pass the new more stringent MOT test, so I sold it to a black guy who said he would export it to his country in Africa, Congo I think he said.Down there they don't care about MOT.. as long as the car rune, they will keep using it.