This used to be one of my biggest issues when I used Fold. To take bitcoin off you needed to withdraw all of it at once. Which made no sense to me. What if I only needed 50k sats to top up my ln wallet? Well the devs finally gave us more withdrawal control for when we stack sats with fold.
Long time coming.
If you have freedom to move the amounts you want, it seems to me that it is not a very good option.