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We have an e-commerce site built on Magento 2. We launched a few months ago, and had about 2K categories. The categories got indexed in Google for the most part. Shortly after launch, we decided to go with SLI for search and navigation because the native search/navigation was too slow given our database. The navigation pages are now hosted navigation pages; meaning, the URLs have changed and they are now hosted by SLI. I have done 301s for the most popular categories, but I didn't do 301s for all categories as we have to go through each category one-by-one and map it to the correct navigation page. Our new category sitemap only lists the new SLI category URLs. Will the fact that we have not 301'd all of our former categories hurt us as far as SEO? Do I have to do 301 redirects for all former category pages?