Why doesn't invasion have quick-charge tear?

The mode itself is very challenging in general. I don't see myself completing all the missions, unless they lowered the difficulty. And even then, I likely wouldn't get any of the premade group missions done.

In terms of items, some items aren't even available, whereas some of what are available are mostly useless, as their effect would almost never be used or used once per wave.

In terms of gold, you've given very little. Being given a little extra gold and giving us the ability to make another item by the last round can make a major difference.

Around the 4th round we had an Ez max out his Muramana. We still lost, but the stacking can be done during the pre-round phase for the full minute and keeps stacks on each failure.

It's ultimately just a waste I think though in terms of better items being available.