Well in the case of his previous game he needed years of work to recreate in unity what is available by default in ren'py.
Honestly this debate between Ren'py and Unity it really gets boring after a while, it's not going to be in Ren'py it's going to be in Unity, Faerin isn't going to change the platform, if you don't like it tough don't play it, I'm pretty sure he won't lose any sleep if you don't.
As for everything being readily available in Ren'py, up until 0.83 it probably was easy to do it in Ren'py but after the overhaul of the UI it wasn't really possible although probably not impossible
As for it taking years to recreate in Unity what is readily available in Ren'py, it took years because of the size of the game, nothing to do with the platform, in fact, Faerin released updates for MOTH every two weeks on a regular basis, how many Ren'py platform devs are doing that?
But by all means, transfer the UI of MOTH to Ren'py and show us all how easy it is, but I won't hold my breath
Mystwood Manor will be in Unity, whether you think it should be on Ren'py or not I can guarantee it won't be, so can we end this futile debate and just enjoy the great game we know Faerin will give us
Larry5168