The recently concluded fourth test in Ashes between England and Australia ended in a draw where England were looking to draw the series , but unfortunately rain spoiled the game which ended in draw.So my question is can the match officials enforce a reserve day (rain interrupted matches) in test cricket on the request of Captain rather than holding reserve days only for ICC events like WTC final? Also the second test match between India and WestIndies ended in draw again due to rain.Where India would have won the match if in case there was a reserve day.So is reserve day only used in ICC events like WTC final , ICC cricket world cup,ICC T20 worldcups only ?
Lets say for argument sake that adding an extra day at the end of a test is easy to organise and available to the teams...
What circumstances are you going to get where both teams agree to play an extra day? In the case of the Ashes, with play abandoned, Australia retained the Ashes. Pat Cummins is never going to agree to a reserve day and risk that. The match officials are literally there to be the people who do not care who wins or loses. Australia not wanting to play will carry just as much weight as England wanting to play.
The ICCs motivation for having reserve days for their finals is to maximise the chances that they can hand a trophy over to a team after the final has been played. They dont have the same worries or stakes with a series between two nations.