Pilots and finales have wildly different energies. A pilot is a carefully-constructed introduction to brand new characters, environments, and plots that don't yet exist. A finale is an attempt to say goodbye to an entire world, just as you've finished building it, and it's not always easy to tie that up in a neat little bow. Sometimes the only way out is to literally blow everything up.
Watching a pilot and its finale back-to-back can feel like you're watching two entirely different shows: