QuotePC: I'm much safer because I have a Missile Tube!
GM: Yeah, not so much. (Gets out harder bad guy cards)GM: Sure, but since you only have a Encumbrance Threshold of 7, and you're also wearing Laminate Armour and carrying half a dozen items, that'll be 5 Setback Dice on all Agility and Brawn checks (EotE CR, p152). Oh, and in fact Missile Tubes have Cumbersome 3, so that'll increase the difficulty as well (EotE CR, p155).
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The narrative reasons presented above are all great, but some players need some crunch to enforce things.