1) The middle/foot area is obstructed
In the center of the bed is where it's easiest to lift the top. However, if the center is blocked by an object or hard to get at, it will be difficult to use manual hydraulics. In this case, it would be better to choose an electric lift system. This way, opening and closing will be more convenient and simple.
2) Bunk beds with a wider base mattress
With this type of bed, the bottom mattress is larger than the top. Since there is not a lot of space between the lower and upper bunks, it is hard to manually open up a storage bed. If an electric lift system is used, storage access is as simple as pushing a button. There is no risk of injury, and you can still store large items underneath the mattress.
3) The mattress is too heavy
If the mattress is very large and thick, it may be difficult for the customer to push up manually. In this case, an electric lift system may be better, so there's no strain on your body.
4) Those lacking in strength or the elderly
If you are worried that you will not be strong enough to lift the bed, or the person is very old or young, then an electric lift may be best. Although the hydraulic struts make it quite easy to lift, it still requires some amount of force to push up. The safest option would be doing an electric system.