I can tell you that 9 times of 10 when I hit a 404 on an ecommerce website, I can’t find the product anymore through a website’s search function. Knowing this,

I can tell you that 9 times of 10 when I hit a 404 on an ecommerce website, I can’t find the product anymore through a website’s search function. Knowing this, sometimes I don’t even bother to search at this point anymore and go somewhere else. So there is at least one lost customer here in such a transition. And, observing how my less tech-literate relatives interact with websites, I suspect there are many more lost customers.