I agree with Qui-Gon here I think the more you copy something the more distorted the copy gets that is why the troopers are not as good as during the clone wars. Also realize these troopers were still good remember Obi-wan's line in ANH,
"Only Imperial Stromtroopers are that precise." Also the rebellion was getting stomped consider ESB they got routed basically. Honestly, Palpatine screwed up the Rebellion probably could never had won a long drawn out war, if it became a war of attrition, he lured the rebels into a trap that ended up destroying the Empire. That is what did the Empire in.
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