It needs to be used where it's appropriate. You can't store it long term and it's thrust is lousy. Works great for a second stage where you need all the specific impulse to build speed but not so much thrust.
One thing the space shuttle should have taught is that parallel staging is downright dangerous. But using hydrogen to get off the ground forces you to do it, and use solids to make up for the inadequate thrust.
Delta-IV would like to have a word with you ...
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