What's the most painful thing about online shopping?

1) broken search (as in returns everything except the thing I am looking for);

1a) search that does not index model/product numbers -- if I have obtained a model/product number from somewhere (say a review), I want that exact item to come up via a search on that model/product number;

2) sites that hide shipping and handling charges until after they want my credit card info (for me, this is an immediate abandoned cart);

3) sites that don't provide any sizing/measurements, or just as bad, provide "dimensionless" numbers (i.e.: Measurements: 12" x 6" x 3" -- is that length, width, height, or width, length, height, or height, width, length?). Sometimes one can workout which is likely which, but sometimes, esp. for near cubic items, it is impossible to reason out which is which. Special points to the few sites that not only label the measurements (12" L x 6" W) but also provide an image diagram of what they consider length vs width vs height.

Shitty companies sell some cheap widget and gain some good reviews (and whether those are genuine or not is a big question too).

Then they change the product profile for a completely different product, but retain the positive reviews.

If you don't look carefully, you won't notice that a high review score is for a cheap toothbrush, not the expensive flashlight you're trying to get.

Clothing that doesn't have a pleasant texture. (feels like coarse cloth, rather than smooth, like silk)

Clothing that is made of the wrong materials. (looks like cotton, but actually polyester or nylon.)