This like arguing that aspect ratios are stupid and wrong because sometimes they apply to a screen which is really big and sometimes it's really small and sometimes they apply to a physical print or a photo or a billboard or a vintage TV and sometimes it's a jpg or a PNG.
Aspect ratio is a ratio. It can be a ratio between pixel counts, or between print dimensions, or physical display dimensions.
All of which are useful in their own way, none of which are directly comparable, all of which are understandable in context.
dB is the same. It's a ratio split into convenient steps - more convenient than Bels would be - that compares two quantities. The quantities can be measured in different units. The units are implied by the context.
The only mild confusion is the relationship between voltage and power ratios. But that's a minor wrinkle, not a showstopping intellectual challenge.
Aspect ratio is a ratio. It can be a ratio between pixel counts, or between print dimensions, or physical display dimensions.
All of which are useful in their own way, none of which are directly comparable, all of which are understandable in context.
dB is the same. It's a ratio split into convenient steps - more convenient than Bels would be - that compares two quantities. The quantities can be measured in different units. The units are implied by the context.
The only mild confusion is the relationship between voltage and power ratios. But that's a minor wrinkle, not a showstopping intellectual challenge.