>not a 2022 model with a 2015 one Well, yeah, but that's an important type of comparison! Obviously (?) people who are concerned about safety want to factor i

>not a 2022 model with a 2015 one Well, yeah, but that's an important type of comparison! Obviously (?) people who are concerned about safety want to factor it in when deciding whether to exchange their car for a new one. You can't do it every year. So if the different years have no particular quantitative relationship between ratings, then they're no help in that respect. "Better" and "worse" don't tell you how much in any way that indicates if it matters. This has a "5" rating and that has a "0" rating, so how many percent better is it?