It's fine. The harder an activity is the less revives you're supposed to have. Time limits that take away your revives are fine too. Just be glad you get to keep going and it's not extinction. If you don't have the skill to deal with low revives and short timers then deal with it. It's YOUR fault, not Bungie's. Stop dying, figure out a way to kill faster, and figure out a way to get better at mazes and jumping puzzles.