One of the benefits Electrum has over Sparrow is being able to watch a list of addresses. So if you have many wallets that you can't or don't want to combine to a single xpub, you can import a few hundred receive/change addresses from each and watch them in a single "wallet." Since the coldcard catastrophe I've done this with all of my wallets.

I used to do with with my 5 joinmarket buckets when I was a market maker, this allowed me to see small earnings made from coinjoins.