Eftersom det är mer en catchy titel
Det menas inte bokstavligen . Som du har påpekat men titeln på filmer som detta är en del av det övergripande marknadsföringspaketet.
Faktum är att den ursprungliga titeln var annorlunda.
The film was written as Teeny Weenies...[snip]..
As Teeny Weenies seemed to appeal more to a child demographic, the name was changed to Grounded to appeal to a more mature audience. That name was later rejected in favour of The Big Backyard.
Honey, I Shrunk the Kids, a line of dialogue from the film, ultimately became its title.