To answer your question directly - yes, I have come across many people, many times, who were unsure or even adamant that bonus squares should be considered following their intial play.
Does that make it alright? Sure, if every player participating preemptively agrees upon it, much like they must agree to limitations of time, specify what book will settle their disputes should they arise and so forth. Does that make it wrong? Technically, yes it is incorrect but who cares? Anyone considering playing this way is obviously no Joe Edley so naturally they wouldn't!
The beauty of Scrabble lay in its malleable nature! In no two parts of the world are there identical rules and conventions set in place that agree with the next game's set of rules;
Everybody uses a different dictionary.
Everybody subscribes to their own personal rendition of the game.
I have encountered many people over my lifetime of scrabble who have been confused and or were insistent on this variation you bring to light being The Rule. Though I do not agree that this is a proper rule of the game as its creators and overseers have seen fit to include - I do not see any just cause for stifling your own enjoyment of the game!!!
I say play it however the hell you please and let no other signal guide than those variantions that move you :*)