I actually agree with this ban.
It’s only on checked luggage.
You can still have lithium batteries in your carry on. Most battery packs aren’t very big at all.
If you are ever on a jet where a fire starts in the cargo hold, you’ll wish you weren’t. Although the smoke will probably kill you first, it’s basically just a hot enclosed griddle and you are the the steak.
So why exactly are lithium batteries dangerous?
What happens when you are on a puddle jumper flight (regional airline) and are forced to give up your bag because of size limitations. The people at the gate have no way of knowing what is in the carry on bag...