This is an excellent explanation why John 14 contradicts posttribulationism.
See three related articles:
https://www.alankurschner.com/2014/02/15/where-do-believers-go-after-the-rapture/
Alan Kurschner, Ph.D. is the founder of Eschatos Ministries, teaching Bible prophecy from a futurist, premillennial, prewrath perspective.