When running wizards that impact price in particular we have never found the need NOT to have all matrix items and parents updated at the same time. So we need to tick the box at the bottom EVERY time to ensure that everything is updated so it presents well on the website dropdowns too and helps with products returned between sale periods.

I have lost count of how many times we have forgotten to tick that box, and had to revert the wizard and start again.

It would be a huge timesaver and failsafe I think to have this box TICKED by default.

Others may have a differing view but I cant think of one for our needs where we dont want everything updating at the same time whether in stock or not.