can you verify me on this?
Yes, that is correct.
To be more precise, a Vector (purple) socket expects X, Y, Z values and they can each range from – “infinity” to +”infinity”, while RGB values are typically between 0 and 1 (but there are exceptions, for instance with realistic metal shaders that use a complex ior, like here:

as you can see, the color n and k are using values greater than 1 here.).
In the case of the SSS Radius, you can stick to a color and only use regular values between 0 and 1 and do the rest with the Scale.