1- doesn't matter anymore.
2- it was played out badly from the start, the passive and indecisive Makoto made everything go bad from start.
3- yes if not for above.
4- yes, but wouldn't need it if no.2 applied.
basically this show was built to give us a taste of the game actually, if they included ero parts more like in Yosuga no Sora, this would have been far more entertaining from the fanservice, instead of showing how stupid kids can be, lucky us they did it exactly the way it was meant to be an anime adaptation of the game, there is a lot of teenage horny business going on in there, without the ero details alone it was very amusing seeing how every single world was shattered and crumbled at Makoto's feet, he brought all of this on himself because he was an idiot that didn't think of consequences of his actions, if no.2 applied, he would live a happy life with any of the girls he put his dick into.
Fortunately this turned out into possibly the best show you can drown yourself into.
Even if you had experience with women/men, this show is the only way to prove you are no longer a virgin, it breaks through your skull like a drill, and leaves you with distaste for mankind, for a day, then you realize "man, this is only anime, but it sure makes an impact"
and that is precisely what it was meant to do, leave a big enough impression on you that would make you think often about it.
Sekai Rules.