The Fast Enter-to-Play mode is probably the most exciting feature in years and it will probably save months of waiting time during the project development cycle on our team. It should've been the part of the Unity from the beginning but I'm still happy that Unity finally recognizes. Unity routinely is asking for feedback but it really makes me sick whenever I hear them. It's not like we didn't give Unity enough feedbacks but Unity does not listen and take actions from the user's perspective. It's late nonetheless it's a good start and I hope it continues. The doc ( https://docs.google.com/document/d/...j-Pd9M71Uz9dc-dg4/edit#heading=h.2gazcsgmxkub ) is really good explaining how thing will change. However, it still lacks explaining how to work around it. If there is one asset causing a problem, this feature will not be usable, therefore I would like Unity to help the asset developers to adopt the new way of entering the play mode as fast/easily as possible. Having some use-cases where it can cause problems and how to work around it would be useful. And in order to do that, it will help to have a new API/Attributes, such as InitializeOnPlayToEnter(and perhaps ExitOnPlayToEnter) and etc. This is the best thing ever happened in a long time and I can't wait until 2019.3 releases. It can immediately save many hours, but adopting the new style will take a while, therefore we need to move as soon as we can. I really hope this feature still be part of 2019.2 preview package. It will make the adoption 3-4 months earlier. This is still an optional preview that won't break if not opt-in, right? Yeah, it will require some core changes but if users do not opt-in, just make the code path to take the old. I don't think it's that hard and I don't see any harm doing it. I'll really appreciate in advance and it will make me think twice about Unity if you can push it. Look how many canceled project or delayed projects we had in the past? Can you please make it something to happen earlier just for once? Cheers!