What the title said.
The issue here is that people don't like random depths. Why? Because they have a chance of getting either a Treasure Vault or a Graveyard. So why not let us be able to choose between Graveyards and Treasure Vaults? The idea would be: if you get the randomly generated level in between, you won't have a choice, but if you get a Graveyard/Treasure Vault you have the option of either continuing or taking the opposite path. Newbies would generally pick Treasure Vault and sacrifice a high payout for some free profit, while more experienced players would pick Graveyard for the heat and crowns.
The issue here (in this post) is wrong.
Actually, people do like the random depths. It adds some excitement and a sense of danger. You know you'll be rewarded well for the graveyards, but they're still scary. You know the treasure vaults don't pay out well, but are an easy relax.
The crap in between is just sayin' "got nothin' bro, regular level" which is usually good and bad.
If you could just choose, it'd kill...all of the fun and excitement behind it, not to mention that crowns/heat would be far too farmable then, just spamming the same level over and over on Strat6 or w/e.