What is the evaluation of Al-Albani's work in authenticating and weakening hadiths and books, especially concerning Sahih Al-Bukhari, and are there reasons for his authentication of hadiths that were previously authenticated?

Shaykh al-Albani is from Ahl as-Sunnah wal-Jama'ah and is well-grounded in the science of hadith. Nevertheless, error is permissible for him and for others.

The Shaykh undertook many works. To learn about aspects of his methodology in evaluating hadith, refer to fatwas with the following numbers: 60598, 140851, 117255. To learn about all his works and their subjects, refer to the book "Hayat al-Albani, wa Atharuh, wa Thana' al-Ulama' alayh" by Muhammad al-Shaybani.

Regarding the statement, "Is it conceivable that for more than a thousand years no one paid attention to editing these books?" If your intention is to criticize Shaykh al-Albani for editing these books because others had edited them before him, this does not harm him, as many later scholars correct those who preceded them. If your intention is to criticize him on the grounds that no one addressed the hadiths in those books, this is incorrect, as many scholars have spoken about the Six Books, authenticating and weakening hadiths, especially the hadiths of the Four Sunan.