i think having a standby line in addition to the Tapu Tapu line would kind of negate the whole point. It would drive up the wait time a ton as you'd be splitting it between two lines now. I don't think it's unfair or stupid to not be able to jump in another line and it's not taking away from what you can do any as compared to jsut having a standby line. Might not be as much to do but you can at least relax, grab food, go in lazy river or wave pool while waiting the 2 hours versus jsut stainding in a line for 2 hours. It'd be the same wait either way so not cutting into what you can do at all by not having a standby line. If anything having those woudl make the reserved lines all even longer as still get as many people queueing but now having to wait for them to load some standby folks. And the standby lines would probably all be extremely long if they jsut focused on teh reserved lines, even if the number of people in that line was low.