This sentence is certainly correct, but people forget that it is only half the expression of Hegel's thoughts on dialectics.

The complete expression seems to be this: "Existence is reasonable, and reasonableness will eventually be realized."

The first half is called negative dialectics, and the second half is called positive dialectics. The former requires people to accept and understand reality, while the latter encourages people to take up arms, change reality, and make reality more reasonable.

The two cannot be separated. This philosophical point of view cannot be judged by simple right or wrong, because Hegel observed the world from an absolutely calm perspective and came to this conclusion. Therefore, this is an attitude towards understanding the world and cannot be judged by simple right or wrong. That’s not right, because looking at the world calmly, everything has its own value and reason for existence, including those bad things. Since they appear, they must have their basis. Therefore, Hegel’s intention is obviously to focus on the problem. Focusing on the roots of these phenomena, rather than their surfaces, not only helps us understand the world objectively, but also allows us to come up with solutions to problems, so this is a good way to understand the world.

However, Nietzsche also emphasized that the Department of Philosophy is a purely bachelor's degree. Therefore, if philosophy lacks social care, it will be contrary to the original intention of philosophy, that is, it emphasizes that philosophy should have humanistic qualities. Then, The cognitive method that overemphasizes objectivity, such as existence is reasonable, is not very appropriate.

This is a matter of opinion and wisdom. There is no right or wrong. There is no need to pursue right or wrong. What matters is which viewpoint you appreciate and which viewpoint can be used by you.