I'd be interested to see even one example where the e-commerce store's own site search failed to return a relevant result that google otherwise achieves. Just o

I'd be interested to see even one example where the e-commerce store's own site search failed to return a relevant result that google otherwise achieves. Just one example. I use Google search too when shopping online. For the purpose of returning a range of websites so I can browse for best price etc. But the topic here is whether Google could do better when confined to one site, and it would also need to return actual products not just "SEO" landing pages talking about those products.