A search interface is built from a handful of recurring components, each with its own design requirements. The search bar or box needs to be visible and appropriately sized, ideally with placeholder text that hints at what kind of query works. The search button needs to be clearly discoverable, not just an ambiguous icon. Autocomplete finishes a partial query as someone types; autosuggest is a related but distinct pattern, offering additional popular or relevant query suggestions rather than simply completing the exact words already entered. Scoped search lets someone restrict their query to a specific section or category rather than the whole space, and the ability to save a query lets someone return to a useful search without reconstructing it from scratch.
Autocomplete finishes your sentence. Autosuggest offers you a better one. Confusing the two in an interface, or building only one when the situation calls for both, quietly limits what the search experience can actually do.
1: Search bar visibility. A thin, low-contrast field tucked into a corner directly fails the basic requirement that a search bar needs to be visible and appropriately sized, no other design pattern issue is at play here.
2: Missing or broken autocomplete. Typing a full, correct product name and getting no completion suggestions is precisely an autocomplete failure, the system should be completing the query as the searcher types, especially when an exact match exists.
3: Missing scoped search. Wanting to restrict a search to a category already being browsed, with no way to do so, is a direct scoped search gap.
A reasonable fix for failure 1: increase the search bar's size and contrast, and give it a more prominent, consistent position in the header rather than a low-visibility corner placement. A reasonable fix for failure 2: implement autocomplete so that partial typing completes toward exact matching product names in real time. It's worth being precise about the distinction the concept section draws: autocomplete finishes what the searcher is already typing toward an exact match, while autosuggest offers a broader set of related or popular query suggestions that may go beyond literally completing the typed characters. Failure 2 specifically describes a missing exact-match completion, which points to an autocomplete fix rather than autosuggest, though this retailer could reasonably add autosuggest as a further enhancement on top of it.