I'll take spiritually lacking but comfortable and convenient over short and largely miserable any day.
Many people would be rather distraught if deprived of some very basic modern conveniences that weren't around. Modern toilet paper, for instance.
easily available non-diseased water. A better than 8 in 10 chance of living past the first seven days, and if so, a better than 3/4ths chance of
living past the age of 5. You know, that sort of thing. Some people might like the simple, tribal life. Most would not.
Historically, people were never all that spiritual. No more than they are religious today. People were always out killing each other and going to war;
apparently many cultures hunted animals to extinction and caused widespread environmental damage. Modern religion is mostly made up of the ancient
spiritual beliefs of unusually successful cultures, which has developed into a set of large organizations which hold power using those beliefs.
Modern man is not very different, really, from the ancient peoples of Easter Island. We can only hope that we don't follow in their footsteps
completely.

