Hi granitic,
Once they are rolled up and/or compressed they are easy to carry and move without damage but latex is easy to rip or tear so you need to be careful not to dig into the latex with your fingers or pull or tug on the latex when you are rolling it up and/or compressing it.
No.
In a single word yes. Ongoing foam compression and deflection is the primary reason that foam materials will tend to soften and break down over time. In an apples to apples comparison between the same types of foam … softer foam layers will compress more than firmer foam layers and layers that are closer to the top of the mattress will tend to compress more than layers that are deeper in the mattress so any softer foam layers or layers that are closer to the top of your mattress will generally be less durable than the same type of foam in firmer versions or layers that are deeper in the mattress regardless of the type of material.
Because latex in general is the most durable of all the foam materals I wouldn’t have a concern about durability regardless of whether the mattress is a finished mattress with glued layers or a component mattress with a zip cover but a component mattress does have the advantage of being able to replace just a single layer (generally the top layer) if it softens or breaks down before the others or if your needs and preferences change down the road rather than replacing the whole mattress. There is more information about the pros and cons of a component latex mattress with a zip cover and loose layers vs a finished mattress with glued layers in post #15 here and post #2 here.
Phoenix