`RewindBlockIndex` was made to allow nodes upgrading to new consensus rules post-segwit fork to 
download new consensus data (i.e witnesses) without having to go through a whole IBD. It has been pointed than now really few pre-segwit nodes care to upgrade and that this logic may be irrelevant.

See https://github.com/bitcoin/bitcoin/pull/17737#discussion_r358514335 in review  of #17737 for more context pointers.
{
    return (fHavePruned && !(pblockindex->nStatus & BLOCK_HAVE_DATA) && pblockindex->nTx > 0);
}
/**
 * Return the expected assumeutxo value for a given height, if one exists.
 *
 * @param[in] height Get the assumeutxo value for this height.
 *
 * @returns empty if no assumeutxo configuration exists for the given height.
 */
const AssumeutxoData* ExpectedAssumeutxo(const int height, const CChainParams& params);
#endif