the reason why rib cartilage get reaborsed is because when you do a nose job, you body thinks your nose is literally broken so it tries to "heal it self", the body will send blood which is why it swells, and because rib cartilage is bone, your body is trying to "fix" the bone by "fusing" it. over time the cartilage will be reabsorbed to a degree. BUT that doesn't mean that your nose will just disappear after a few years. If the reabsorption is a lot, most people get it done again without much difficulty.
I understand that a lot of people are really uncomfortable with the idea of silicone but I also feel like a lot of people misunderstand it. Yes, it is a foreign object but comparing it rib cartilage there are different pros and cons. For silicone, you're not limited to the cartilage you have, for some people who want non-implant surgery, they have to use a combination of septal + rib (usually because they have a low nose bridge and are trying to achieve a much higher nose bridge). When you use silicone you're not limited to how much you can get from the cartilages. because it's a lot more customizable, you can kinda predict what the outcome is a lot better than other methods. if you show a doctor a nose you want yours to look like, silicone does a better job at making your nose as close to the reference photo as possible because the doctor is(should) be customizing the implant to the reference. A lot of people like the outcomes of silicone better then rib.
Rib cartilage is also a lot more harder than the type of silicone they use today, this wasn't the case a while ago, now many clinics use ultra soft silicone. Silicone is also a lot easier to perform revision on vs dcf. Rib cartilage is also mainly used for revision because usually you have already use your ear/septal.
rib cartilage is usually 2-4Mil won EXTRA on top of the surgery cost, depending on if you use your own or donated.
If you're asian, usually ear + septal isn't enough depending on what you are trying to achieve, of course. If you are not trying to raise your nose bridge but define your tip or do functional rhinoplasty, ear and septal should be enough, and I'd wouldn't recommend silicone or rib.