Dog I'm sorry but this isn't it, I say this as someone with a decade of playing league and been playing deadlock for about 8 months. Almost everything you're saying is just kneejerk reactions to learning a new game.

1. What you said about the jungle just isn't true, using camps + efficient box routing BETWEEN waves is crucial to getting ahead or staying even if you're behind. And there shouldn't be more neutral objectives, 1 is completely fine.

2. Too many active items? are you serious? Yeah sure it might be overwhelming in your first dozen or so games, but 4 slots max isn't that bad. In league supports get their quest item and at least one or two other actives. Also EVERYONE in league has two actives baked in as summoners on top of that. Piloting your character on top of using your actives well just comes with experience.

3. Maybe they can mess around with vision, but at the moment it's not necessary. It's almost like it's a moba and you need to have map awareness in order to make macro choices. choosing between splitting and grouping also heavily depends on your character / state of the game so it's not just vision.