Thanks for writing this and passing along this new terminology of SGAI (at least new to me.)
Under the hood, SGAI is using HLS Interstitials, correct? (At least I believe that would make sense with what I understand of Disney's architecture.)
The other major benefit that I don't think was mentioned here is that start-up time can be drastically improved from SSAI. Essentially, acting in the same way as CSAI with ad resolution happening near the time of the ad break itself.