You cannot call it Perfect in the same way that you cannot call a meal or a piece of art Perfect. Anything that depends on the needs of the business or the pref

You cannot call it Perfect in the same way that you cannot call a meal or a piece of art Perfect. Anything that depends on the needs of the business or the preferences of the user doesn't have a best solution fits all by definition. For instance, if you wanted to filter a list of 100 items in the front-end this is instantaneous; a filter-as-you-type might make more sense. However if you are in a back-end search you'd want a button and a full page refresh might be acceptable. Finally if the search is going to take few seconds for any justificable reason don't do a full page refresh and leave your user hanging in white; a load indicator or a streaming search might be better suited here.