Before going ahead to make reports I advice you thoroughly make your investigations and not just handpicking phrases and Automatically assuming the whole context was AI generated.

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Regarding the current situation, it's important to note that the block size of Bitcoin is actually limited to 1MB, not 4MB. However, the implementation of SegWit allows for more transaction capacity by separating some of the transaction data. This has helped alleviate some congestion on the network.

As for ORDI and its impact on the blockchain, there's no doubt that it's causing additional strain on the network due to the on-chain nature of its operations. Thereby resulting to a slower transaction times and higher fees for Bitcoin users. It's an ongoing challenge for the Bitcoin community to balance scalability and decentralization while accommodating new developments such as NFTs.
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You're correct that the Bitcoin blockchain cannot be rolled back, as it operates on a principle of immutability. Rolling back the blockchain would undermine the trust and integrity of the network.

In terms of addressing the congestion caused by ORDI transactions, it is indeed possible for mining pools and individual nodes to implement settings that exclude or prioritize certain transactions. This can be done to mitigate the impact of ORDI on the network and prioritize other transactions.

I apologize for the confusion. You are correct that the maximum block size in terms of weight units is close to 4MB. While the maximum block size on-disk and over-the-wire can be almost 4MB, this size is rarely reached in practice.

The actual size of a block can vary depending on the number and format of the transactions included in it. If the block contains a large number of small, simple transactions, the block size will be smaller. On the other hand, if the block contains complex transactions with many inputs and outputs, the block size will be larger.

It's important to note that the Bitcoin network has a block size limit to ensure the stability and security of the blockchain. This limit helps prevent spam transactions and ensures that blocks can be propagated and validated by the network efficiently.

The block size debate in the Bitcoin community has revolved around finding the right balance between scalability and decentralization. Increasing the block size too much could lead to centralization concerns, while keeping it too small could limit the number of transactions the network can handle.

Overall, the actual size of a block will depend on the specific transactions included within it, and the block size limit is a critical factor in maintaining the functionality and security of the Bitcoin network.