One of the other responses here was from a (former?) chrome dev and they said the feature was implemented, had a lot of issues that could be eventually fixed bu

One of the other responses here was from a (former?) chrome dev and they said the feature was implemented, had a lot of issues that could be eventually fixed but cost too much dev time to be worthwhile, and nobody used the feature anyways. While the dev said he didn't know why it got dropped, it was likely the lack of use and excess cost.