Maps worked fine since 2000bc, and yet now most have Sat Nav and not all are lazy or idiots, some scenarios technology is necessary.
Reversing cameras are useful for situations such as car parks and heavily built up areas where trying to park in confined spaces requires quite a high degree of skill and judgement, where often other factors (pressure from other motorists fighting for the space you want) can make people rush their parking move and have a scrape.
Such as..
* Those who aren't very skilled in parking, or lack confidence including elderly.
* Physical limitations that make it hard to turn neck, e.g. arthritis/neurological problems.
* People who worry about damaging their own vehicle or others due to many factors.
* Carry loads/having an obscured rear view and no rear parking sensors.
If you live with people who are elderly or disabled who still try to keep remnants of their independence by driving, you will see they often have less confidence than younger people in parking, and or those with other conditions that affect physical and neurological judgement who don't have a full range of movement to be able to observe as well as able bodied people.
I saw that cheap camera on Ebay essexpestcontrol posted, but I doubt it fits as Freelandie71 also mentions. It says Freelander 1 on the fleabay advert but if you look at the design it's not the same, and looks like it's from a Disco or a Rangie classic as the number plate light design is different.
Even if not, I'd save up the pennies for a reasonably good rear camera with advertised LED nightvision (or very low lux operation) and get a second hand quality head unit (Pioneer/Alpine/Kenwood) that supports a rear camera input, and mount the camera near the rear door latch and have a camera when you need but now a decent double DIN sat nav/car stereo with bluetooth hands free for the phone. It won't look very good externally, but the cameras usefulness overrides this for people who need it.
My dad was a great driver but had a stroke. His parking is now abysmal and I can't get out and help him easily (the few times I get out), so a camera for me would be very useful and my mother too who is nervous driver since getting squished by a lorry driver. In fact she refuses to drive at all, simply due to nerves.
Many people aren't confident drivers, even though they own a driving license and can drive safely at their pace and limitations they live with, so for these people parking cameras literally are a disability aid, which for some without disabilities affecting parking rear cameras may indeed surplus to requirements, because they were never available in the past. Sometimes though parking cameras have a good reason to be used and so I like them a lot, and wish I had one fitted. I'm amazed other people can park huge great estate cars, but they are more skilled than I. We aren't all skilled or confident drivers, well not any longer. Maybe practice makes perfect.