I think the sibling comment on this thread kind of disproves this to some extent. Sure, some simple in-memory search library might be good enough for a command

I think the sibling comment on this thread kind of disproves this to some extent. Sure, some simple in-memory search library might be good enough for a command palette or for "apps", but the fact that even tiny docs and "marketing" sites that try to implement site search are almost always outdone by google "site:example.com query" really goes to show how much value a full stemming / synonym clustering / syntax normalizing search engine can bring.