Stripping and re-anodizing aluminum alloys usually results in a mottled finish. Anodizing leaves a fairly porous surface, and you don't really remove all of the anodizing in a chemical process - it gets into cracks and crevices, so you'd have to mechanically remove it (polishing), which is labor intensive, and you might miss some spots.
30+ years of specing anodized parts in the semiconductor business and working with lots of platers (common name for those that do anodizing) taught me this.
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