as we can easily send funds to anyone anywhere via a blockchain network.

Yes we can send funds to anyone anywhere in the world with a few costing almost nothing. If we were to do it in a bank it will Cost us a huge transaction fee.

We have seen cases where transactions carry quite a significant amount of time to be executed in some blockchains.

Because we have become accustomed with the fact that a blockchain is generally fast and should be able to finish our transactions In under 5 mins we normally get worried or bothered when it is not so. Even when a blockchain delays a transaction is can bet you that it is still better than going to form a long queue at the bank just to send money across or receive money.

One of the most prominent blockchains (Bitcoin) has been known for taking a huge toll on the natural resources of its environment

Yes this has been of major problem to most people.

Because mining of crypto requires a lot of power and it ends up harming the environment.

a patient's unique hash is entered his medical record from anywhere in the world would be pulled up, this will reduce the hassle of carrying pile of documents

Yes this will intend save the sick from all the pain whilst he is waiting to see the doctor.