Do you think that abolishing that legal caste certification would protect the Dalits better? Do you think that removing the part of the Constitution that acknowledges caste by outlawing untouchability and caste-based discrimination would protect the Dalits better? Do you think that allowing the other castes to self-identify as Dalits and take Dalit affirmative action places would protect the Dalits better?
The Dalits themselves think that a State refusal to acknowledge caste makes things worse for them. British Dalits are campaigning for caste to be acknowledged by the State through adding it to the Equality Act protected characteristics.
There's a saying, "if you don't see race, you can't see racism". This applies to sex and caste too.
We have seen white people self-identify as racial minority to steal university places and funds and conference places reserved for Black and brown people. We have seen men self-identify as women to steal sporting team places and medals, industry awards, and to use female services.
The Indian govt has created the caste certificates to prevent non-Dalits from pretending to be Dalits, to stop the Brahmin equivalent of Benjamin Butterworth or William "Lia" Thomas from stealing Dalit affirmative action places. The Indian govt has set up a robust verification system to govern the issue of such a certificate.
By contrast, the British govt continues to issue falsified ID to men who pretend to be women. It is this failure of the British govt to tell the truth about the sex of British citizens, standing in stark contrast to the Indian govt's refusal to lie about caste even though proving caste is harder, that the OP wished to talk about. This is clear to all posters on this thread bar two.