I don't think lithium will every be cost effective and practical , really large scale,
Imo it's not cost effective at the RV level, although it can be practical , considering the weight savings
But if we did not have Dreamers and Believers
We would not have the technology we do have be it steam or electricity or nuclear
This was all because of people that dreamed of doing it
And spent their lifetime bringing it about
Portable electronics, need light weight rechargeable batteries
Power stations, off grid housing, stationary EMG backup power, does not need to be expensive light weight hard to manage lithium
But it takes people with 'can do spirit' to try, and sometimes fail
Or nothing will advance
What if it is 'advertising' , if it works that's great, if it fails something is learned,
If the Naysayer's had their way, the trans contential railroad would never have been built