At all the creative and design meetings, I imagine it was like:
"Hey guys, we're going to do a musical based off the ALICE IN WONDERLAND/THROUGH THE LOOKINGGLASS story. Audiences know it so it's sure to hook them in.
But we are going to modernize it. This thing needs to sell, and I don't want to scare away any parents not wanting to take their kids to a "period piece" and I don't want to turn off tweens to it by making it "not cool." So we're going to make it about a mother and daughter so both age groups will take to it.
The costumes and sets need to be BIG and OUTRAGEOUS. Think WICKED, but instead of in Oz, we're in Wonderland.
I want people to SEE their money. Make it look intricate, detailed, grand, and expensive. It should be an EXPLOSION of design, FILLED with boldness.
Throw in a boy band number. The tweens will go crazy for it!
Make sure we have an 11 o'clock number. A big power ballad for the lead.
There needs to be lots of opportunity for wild, zany dances.
Throw in a number for the Queen that references other musicals. This way the theater snobs won't attack us as it'll distract them.
There's our start. Now write a show around this! Take as long as you need to write it, just make sure it's a big fat musical hit that is grand enough to ensure a run for 10+ years!"
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle