The reason there are no parachutes on commercial passenger planes is that there’s almost no way you could get outside of the plane to activate the parachute.

The emergency exits are there for after the plane crashes, if the plane is in the process of going down it would be very difficult to exit the plane. You’re likely pulling a several gs while falling and even if you could make it to an emergency exit it would require super human strength to open the door while the plane is moving that fast.

Fun to know Joe thinks about random stuff like this too. Also, you can buy an emergency parachute and take it on the plane but it would most likely be pretty useless if the plane does go down.