100% this!
Digital advertising is not evil, if I'm going to have to see ads to keep services free then at least I want them to be relevant. let's face it, the ad supported model is not going away, it's been here since the beginning of publishing. Just because we've moved from printing press to web browser and app doesn't change the fact that the underlying business model is the same.
In the end, ad networks WANT to show you ads you are interested in, if they show you a bunch of generic stuff the chance you will buy their product or service is much lower. As consumer, I want to see ads for things I care about an digital ad networks act as the matchmaker.
Advertiser ID is totally anonymized anyhow, it just helps advertisers connect the dots and get to know you better. Think about it as training your on personalized AI marketplace concierge!
I realize this is a idyllic view of digital advertising and the current state is more manipulatable but regardless, denying access to this data won't make any experience better or more personalized and ultimately ad networks will just use other heuristics that already exist to do the same thing.
Personally I just see this as a marketing spin for Apple, to differentiate from Google and Facebook, to try and align perceived values with the consumer. Frankly, it's brilliant, the public and press are eating it up like thanksgiving dinner.