It depends on the model of RPG. Some are designed to be single use only, like the 66mm rocket, and others are designed to be multi-use like the RPG7V and the Carl Gustarv 84mm.
With the multi they are required to reload because you can only have a single rocket within the shoulder launcher because of weight and fire control issues
Single use weapon systems can be made from light materials like glass fiber, to bring the weight down. Single use LAW M72 weight around 3kg, where multiple use RPG-7 weights 8kg.
Firing an RPG or Anti-tank missile will give away shooters position easily due loud noise and smoke. So it’s nessessary to be able to discard weapon and relocate quickly.
Javelin is separate launcher/sighting system with anti-tank missile that’s in single use launching tube.
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