These applications would not be particularly well suited for blockchain technology:
- Digital Identity
- Data management between organizations
- Patient chart
- IoT
The above would be better suited to use cryptography technology. There is little advantage to using blockchain technology for any of the above, because once an entity has access to the information, they can trivially replicate it in unencrypted format.
Encryption cryptography is irrelevant in this case (when you use blockchain to store the data), what those applications need is
Zero-knowledge proof where you can prove the information is valid without revealing the information itself.
Obviously, it has limitation which limits it's usage and not all applications is possible.