I follow a guy on Youtube, who has a second hand car dealership, and reviews cars on a fairly regular basis (Matt, High Peak Autos (?))
He makes a very good point that ALL cars can develop faults, but many don't - it's just the luck of the draw. Some cars have known issues, but still don't develop those faults, and that comes down to 'Caveat emptor'!
I think the other point is that reading various fora might become a cause for concern, but remember - people rarely post messages saying how wonderful a vehicle might be, but will always !Removed!/complain when they have an issue - if Jaguar sell millions of cars, and a handful of people complain, is it really a cause for concern?
Finally, do bear in mind that modern cars are hugely complex devices, and the more complicated something is, the more chance there is for it to fail. In the past, I used to look after my own vehicles, but am now of the opinion that most modern cars should have a sticker on the bonnet stating 'Do Not Open - No User Serviceable Parts Inside'...