My first few years of professional SEO experience was purely automotive e-commerce. It wasn’t until years later where I’d begin taking on SEO projects for other types of sites (local businesses, startups, etc) that I’d begin to understand how different and unique e-commerce SEO was in relation to other sites. The sheer number of factors and potential mousetraps is is astounding. Fortunately there is an answer for every problem.
The sheer number of pages
Whereas a local business or SaaS website might be a few pages (occasionally, a single page), e-commerce sites generally have thousands, sometimes millions of pages. What this means is that one small change can have resounding effects. This makes it even more important to correctly silo your pages and still make them crawlable.