It's called decentralization. They are all official. But check them out with people who know, and then test the ones you download or use. Only after you are positive they are good, then put a chunk of bitcoin into them.

How not?

https://bitcoin.org/en/wallets/desktop/windows/bitcoincore/?step=5&platform=windows

What does not exist is an official wallet. And if you don't understand why it doesn't exist, you still don't understand what Bitcoin is. Decentralization is necessary for security

You do not need to bother yourself about this, there are alternatives, there are decentralized spv versions with open source blockchain. There are also very good wallets like electrum. Electrum source code is an open one which is available on github, it is also a good wallet. Bitcoin and  bitcoin wallets are so decentralized than for you to be thinking of such wallets, as they actually existing. Try decentralized spv versions or wallets like electrum.

That's true I was victimized by a scam wallet, it's open sourced any individual, group or companies can create and launch Bitcoin wallet, we have many wallets now the only way to safeguard yourself is to audit the team and the source and read lot of reviews before using them, when it comes to wallets, reputation ranks high in the list.

if you don't do your research you will end up losing everything.

A bitcoin core without blockchain... i see, is just like KFC without chicken... 

For a service like this someone has to run the node and provide the service, and that service will have a lot of responsibility because it will hold the customers private key... so, is a risky move, and we can't trust in any random user launching a service like this.

But Blockchain.com already thinks about this idea and already launch the service

"Official" usually means they can get away with stealing your stuff.

Well said Satoshi Nakamoto did not designate any Bitcoin wallet in his time since it's open-sourced any person or company can create one and there's a lot of wallets now and more are coming up, the most popular wallets now are the multi-currency wallets like Atomic Exodus, because it's profitable business these kinds of wallet has a build-in exchange.

The official wallet will serve same as that of the PayPal, this means the service will be centralized and market widening won't happen. Now with the network being decentralized more and more number of wallet services have emerged paving path for the growth of bitcoin.

If developers keep focus on developing an official wallet, even a small hack or security breach will directly affect the trust over the network altogether. Now with different number of wallets, the cryptocurrency network becomes stronger than before.

Because you are now in control of your own wealth and you are offered several different choices to exercise that freedom.    There are no centralized organization or government to dictate to you, on what wallet would be the "official" wallet or what restricted choices you should have.

Imagine a scenario where people are all forced to use one or two wallets and those wallet providers goes down.. it would severely influence Bitcoin's future. It would also make things a lot easier for government sanctioned hacks to take down Bitcoin, if they hacked those two wallet providers or a large collection of users of those services.  

'official bitcoin wallet', 'It will be exactly like bitcoin core, but without the blockchain'
Sounds interesting, what are you talking about, how to be like bitcoin without blockchain. I do not understand what you mean. There are a lot of companies developing blockchain wallets right now and they are doing so well that there is no need to create a bitcoin wallet. That would take more time for the DEV team instead of focusing on bitcoin development.