In principle, we need to remove the strange requirement of building 5 levels before being able to rebuild any of them. Sometimes you can't get Haste or Slow without rebuilding, not to mention "Town Portal, etc."
Well, that would lead to obtaining Town Portal significantly faster, which is also not ideal. And the struggle of searching for Slow, especially on Jebus Cross, adds to the spectacle ))
I was specifically writing about the Castle town, where there are only 4. Is it reasonable?