What makes you think this is a result of rule changes or that those examples did it? I'm not saying you're wrong I'm just curious if you know this for a fact.
There are still in-person rush and lotto... I think? Little Shop was doing in person lotto, I can't remember if that was pre-pandemic or this past summer (I think it was this summer), but it was well after Hamilton craze (and starring a Hamilton star).
Some theaters have space to maintain a crowd, like Shubert Alley or the plaza where Wicked is, etc. So it's not always an issue. But also, I think producers love having lines and crowds gathered, it's free publicity and amazing for word of mouth and public impression making. It also creates a spirit of fun and community among fans. Presumably if there were rules set in place it wasn't at the request of producers or fans, but just saying.
But the fact that there are still in-person ones make me think there aren't rules because you can't predict what show will be a hit or have a popular lotto/rush, so it's not as if they only have the rule for big hit shows, I assume..