The fact that it is not physical makes Bitcoin
more valuable. Why? Because I can store millions of it in my pocket. I can move millions around the world in less than an hour. 24/7. No banks or approvals or intermediaries required. I can keep it in my own custody safety. It is easy and fast to exchange. It is easy to validate its authenticity. The supply is fixed and near impossible to dilute. Etc.. Etc..
that is why Bitcoin is valuable. It’s valuable because it stores value with all the important properties I listed above. Those properties are intrinsic to Bitcoin. Say that for any other asset.
If you’re worried about civilization crashing and Bitcoin becoming worthless. Fair enough, you should diversify into guns and toilet paper.