consolidating them at a time when mempool fee is low, can be a big money saver.
Saving the money is not a lone motive for consolidation especially when the issues at hand are UTXOs relevant to hardware wallets which generally have limited size of memory allocated for transaction data. If the given transaction has a huge number of UTXOs to sign and associated data don't fit the memory of HW, the latter will refuse to proceed with signing and stall out.