Barriers to progress forward don’t come down once objective has been met, or take several minutes to come down. Example: got dread today - destroyed 3 splinters in first area. Several minutes later barrier came down. Destroyed 3 splinters in next area. Waited several minutes, barrier did not come down. Gave up.
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This is more than salt mines. A lot of barriers take too long to come down or the wait for the next round of enemies to spawn takes a while. Game really is trying to slow down progression at every level