Or maybe they're all moving so much toilet paper that they have to cut less essential deliveries.

I'm not sure if you are joking or not, but toilet paper is in no way an 'essential' delivery. Any company that would think so gets a fail in logistics....

Tell that to someone who doesn't have any and can't go out due to health conditions.

order a bidet instead.

try, they're sold out still

A vast quantity of the population would disagree with you.

fedex is a generation behind many other logistics providers

Not true by any stretch of the imagination. For one, Fedex has the 5th largest air fleet of any company in the world and they are the only freight operator in the top 10. They also have the highest scheduled air freight-ton miles by a long shot. Their ground network is impressive as well. While far from perfect, I would be quite hesitant to call that a generation behind.