So many people simping for centralized exchanges. On a bitcoin forum as well. Unbelievable.

Here's the real answer OP: Laziness and greed.

They are either too lazy to do any research before they start and find out that centralized exchanges are some of the most corrupt and most scammy organizations in existence and the most dangerous and risky place to leave their coins, or they are so lazy that they know all this but decide they can't be bothered to set up a wallet and write down 12 words, so will just risk all their coins instead.

Alternatively, greed. They are willing to risk their coins on these centralized exchanges which promise them interest, staking, or other rewards at obviously unsustainable levels, even though we have seen dozens of such platforms scam or go bankrupt and everyone who was using them lose everything.

Misinformation is also a reason, some people think that because bitcoin is decentralised, every thing related to it is also decentralised, for example because exchanges are needed in cryptocurrency and for bitcoins, that they are decentralised. Some set of newbies do not really know what decentralised should be and it's importance, to them decentralised is just another word.

Anyone using centralized exchanges for storing Bitcoin and not just for buying or selling crypto does not deserve to be called a true Bitcoiner. 
Those who save their coins on centralized exchanges are those who I believed to be misformed, or will I say they are people who are not yet ready to take responsibility for their own security?
If not all that's just required is simple step, create wallet backup their wallet and take responsibility of their own security and not hand it over to a third-party which promise's what they can't actually keep.
Centralized exchanges are just meant for trading and not for storing crypto; there is no better use for them than that. 

Their is no level of misinformation that can make one not be able to differentiate the difference between a centralized system and that of decentralization.
What exactly makes the person to be a Bitcoiner if they don't care about their privacy.. once you enter a platform which requires you to make some kind of verification that's above email confirmation, to the level that you need your ID and personal information. You should be concerned enough even if you were misinformed from the first place, you have the right to ask for clarification. 

Bitcoin is indeed decentralized, anonymous and those who own it are financially free, but at this time there are still many countries that have not allowed bitcoin to be fully legal, let alone to be used as a means of payment, it seems that it is still far from being able to happen throughout the world. Even though there are countries that use bitcoin as a means of payment, such as El Salvador. But still, that's only one country, there are still very many countries that have not been able to fully accept bitcoin.

And thus, bitcoiners must still follow the rules made by their respective countries, even though it is against the philosophy of bitcoin. But it is still an obligation that must be carried out by its citizens. such as using legal money in the country, and other rules.

maybe that's the factor that makes bitcoiners still use fiat money, a centralized system and other rules.

Only for comfort you have to pay. And sometimes you have to pay by unpopular methods, like KYC, for example. Yes, CEXs can provide enhanced security measures (such as two-factor authentication). However, it's important to note that CEXs can also be vulnerable to hacks and security breaches because they store large amounts of user funds in one place. So you need to be careful when choosing CEX for your use.

I don't believe a centralized exchange provides additional security, as you claim, because I always feel unsafe when using one.

Remember that you will be providing your personal information during KYC before the exchange will allow you to trade with them, so why should I feel safe with my information and Bitcoin in their hands?

I hope you are aware of what happened with FTX; this should serve as a warning to avoid dealing with centralized exchanges because they cannot be trusted.

Centralized exchanges are, by far, the least safe and the most risky place to send your coins.

You cannot be anonymous when using a centralized exchange. Even if you don't complete KYC, they log absolutely everything you do, everything about your computer, device, IP, location, etc., and use blockchain analysis to look in to the history of your deposits and withdrawals.

There exist non-custodial exchanges which allow day trading via smart contracts and atomic swaps.

In addition to high liquidity, centralized exchanges also usually have a simple and clear interface that allows traders to easily understand and execute buying and selling operations, while decentralized exchanges can be difficult for beginners to use. From my experience, I can say that one of the advantages of using centralized exchanges is the customer support service, which provides fast and efficient support in case of problems.