Well they are not completely transparent of what is happening with your funds on chain when you use lightning, I know they keep you funds on chain but some time after an extensive use of lightning you can have a different amount on chain and what the wallet itself is reporting , I guess they keep a little room for small incoming transactions but like and that can be alright for a hot wallet but for a long term wallet there are other better options. Coin control is something yo consider if you like privacy.