It's an important start. The level of transparency required to hold this kind of advertising accountable needs to be maximal, I believe. For example, most Facebook users are not aware that political parties and campaigns upload their voter registration files into Facebook to target them individually, by name. The way you find that in the Facebook interface is very difficult, and it doesn't show that one-to-one level marketing in even Facebook's transparency tool that it launched here in Canada.
I think the maximum amount of disclosure will be beneficial to concerned citizens as well. I think it comes down to that granular level. You should know that you've been targeted as an individual voter for particular messages, rather than the segmentations that they claim. Also, people need to know if they've been assigned to what's called a “lookalike audience” as well. That creates a similar kind of one-to-one targeting without your name being attached to it.
I would advocate for as much disclosure as possible when it comes to political advertising, and maybe advertising in general.