"Regardless of how much longer we have, it's better for both Jagex and players to find out what does and doesn't work early, instead of spending developer and/or player time on systems that just can't work or poor implementations. So why are you being so dismissive of learning from the time already spent by other developers?"
I see this is exactly what RS3 is doing. They are taking baby steps with skill trees on Necromancy. They are building the foundations, and of course, through the process of building it like they did with Fort Forinthry and later City of Um, as well as all kinds of 3D graphics updates, they can show to our own RS3 players' eyes they can do everything. Then they move on and grow the skill tree like how they grow our Fort and 3D graphics incrementally.
"Okay, please go to Zamorak phase 7 and have your familiar stand by a rune without attacking it while you're attacking a different rune far away. If you can do it at all, it's going to be very annoying. With a proper conjure control interface, it would be easy."
There is a familiar interface where we can command our familiar to attack or not attack.