Does blockchain have any value if you trust all nodes? If we are designing a new project or application whatever it is, and you can trust all nodes, should we still consider blockchains in the architecture? 

I saw this video of IBM and I was wondering why choosing blockchain as a solution

https://www.youtube.com/watch?v=tdhpYQCWnCw&amp;lc=z23mitvo0ki5sgplm2hd0syvq1wb1yadphkj5vl0mj00u00c2.151904784581

Wouldn't regular database solve the problem either way? 

Could somebody explain?
By design, a blockchain is inherently resistant to modification of the data, so if you own or trust the nodes and you can modify that data anytime, so blockchain is ineffective. 

If you were trying to use the blockchain technology just for storing data and for the highest availability, A regular database with some extra connected nodes would do the job.