In addition to various expressions such as the Game Theory, Byzantine Generals problem, Scalability, etc. etc.; you may have come across the Scalability Trilemma.

This term owes its origin to Vitalik Buterin, the founder of Ethereum. It expresses the concept through which it is very difficult to obtain a decentralized, secure and fast blockchain.
In one way or another, one of the three variables comes into conflict with the other two.
For example, Binance Smart Chain is fast and secure, but it is not decentralized.Yet.

Bitcoin's lightning network is fast and decentralized, but it has proven to be vulnerable to attack.

Finally, again Bitcoin and Ethereum, they are highly decentralized and have been working for years without major problems, but it certainly cannot be said that speed is their most valuable aspect!
That is why, as of now, it seems impossible to obtain a perfect blockchain but through appropriate IT devices it is possible.
Some projects, such as Solana, Cardano and Avalanche, in good company of the developers of the next Ethereum 2.0, are convinced that they have found a valid solution to the Trilemma.
But if that were the case, Solana would not have invoked an "All Hands on Deck", in fact last December the Solana blockchain inexplicably ceased to validate blocks.
Seen in this way, at this point we could say that a fast, secure and decentralized blockchain will never exist.
Let's not rush things and analyze well everything in our possession.
A few weeks ago I talked about the Cross-chain or interoperability between blockchains; this could be a good starting point to be able to give the final blow to the Trilemma.

In fact, some dApps can be launched on decentralized or centralized protocols: the code is the same.
But this dApp can draw on two different sources and take advantage of the positive sides of one and the other.
For example, it is possible to carry out transactions on the Binance Smart Chain, which is fast and cheap, using the Ethereum blockchain in parallel to protect from vulnerability.

In other words, this is what the 1Inch project aims to do.

This method of exploiting blockchains can not only be useful for solving the Trilemma, but also for automation.
Automation not intended in the sense of the IoT, but in the sense of the use of dApps that perform tasks instead of the person concerned.
Let's take an example of a DeFi user who does not feel so safe in carrying out the operations, since the first moment that if he fails to enter a character in the address, the tokens are lost.
For this reason, dApps can be developed that reproduce transactions.

In addition to this, an impediment due to privacy is also established, in fact some sensitive customer data, it is more correct that they remain on a centralized blockchain.

I have already talked about this in this article, regarding DeFi.

The last very interesting aspect of this interoperability of blockchains is the collaborative aspect that can arise.
Instead of struggling sterile to solve the Trilemma in a solitary way, it is possible to dedicate oneself to the absolute solution of only one of the 3 variables and collaborate with other teams to arrive at a solution of the problem together.
Also in this case, the blockchain would teach the human being that things done alone are done first, but things done in collaboration take a long way!
What do you think of interoperability?