Like a bass, house, meal, etc. you don't NEED the expensive one. Whether the expensive one is worth it is up to you.
I don't know if it is, because like many basses, you can't really go try one out in a realistic way. Sure, you can drive one for 5 minutes at a dealership and spend the next 30 trying to get the salesman off your back, but that isn't really the same thing.
What I'm trying to is get info from people that know more about these things than I do. I think I spelled out that for me "worth it" would be objective, practical improvements in durability and reliability; would be technological advancements that make the vehicle more efficient since I drive a lot; and if there are any real changes that make the actual drive more comfortable or pleasant.
If a Corolla and a Camry have the exact same transmission, suspension, and engine, that means there won't be a substantial increase in reliability, and the efficiency might be less in the bigger car because of its size. So then that wouldn't be worth it, since size is a small factor for me; I'm alone in my car 90% of the time, I'm a class D\Barefaced kinda guy, I don't have toys that need hauling, and my wife has an SUV for big stuff.
Similarly, if a Lexus was to use the same tech, and they just have nicer interiors and a shinier badge, that isn't worth anything to me. However, if they have a more precision engine that will keep ticking longer, that does mean something to me. Horse Power is nice, but isn't worth a lot to me since my drive a straight shot of 75mph on the freeway for 35-40 minutes. I was able to get 80k out of my brakes because I don't sit in a lot of stop and go.
What I really want is to not have to think about my car anymore. I'm sort of jealous of the posters that say they've been able to get 200k out of cars that only needed gas and oil (tires and brakes are unavoidable as well.) I've only been driving for 23 years (I didn't get a car until I was 20) but it would be hard for me to add up the number of them that I've gone through. I'm over the revolving door. I would have held on to my Mazda 3, but the fates just weren't having it. My Focus has been one thing after another, although admittedly, and thankfully, nothing super serious.