You are very true. Though build back better is logical, it is not being followed as a policy in most countries. In my view the gaps include:
1. Lack of awareness that build back better can be achieved
2. Not sufficient information on build back better, and limited access to real examples and cases of build back better
3. Lack of capacity and understanding of the topic
For the way forward, I can mention the International Recovery Platform, which provides very good compilation of cases and examples of how governments around the world, both developed and developing, have tackled the challenges of reconstruction and recovery, and have achieved elements of build back better.
Have a look at:
The guidance notes have over 550 cases and examples, explained in very simple format.
The IRP also provides training on pre-disaster recovery planning, both directly and through the IRP partners.
All organizations engaged in recovery need to help the governments build their capacity, and understanding of build back better.