It all depends on exactly when they're mandatory and what tracking is associated with them.
My own personal thinking has evolved on the subject since I campaigned against ID cards under Blair ("no2id"). It is a question of trust and purpose. Things like the Estonian digital identity scheme do not seem to be bad in practice. The problem comes from identity checkpoints, which serve as an opportunity for inconvenience, surveillance, and negligence by the authorities.
Remember the "computer is never wrong" Fujitsu scandal? The Windrush fiasco (itself a story of identity and records)?
And anything born of an immigration crackdown is coming out of the gate with a declared intention to be paranoid and authoritarian.