Rebel bases/sentinels

Remember in HW1 when other bases in multiplayer were taken by rebels, forerunners or flood? I don’t understand why HW2 would do away with this. Its great for early game to help some units achieve veterancy, and it just adds to the mix as well. There also used to be a way to purchase sentinels like the shield, protector or attack sentinel and attach it to any unit. And even the feature where we could release the flood at a certain player or even yourself, this was great at harassing your opponent or building veterancy for urself… I think these little things should be brought back.

I also hate that the map starts off as open.