But this principal is exactly the one used when arguing against a stopping clock - that it would be impossible to manage at grassroots therefore cannot be trialled at professional levels. You can't have it both ways: either the laws need to be consistent at all levels in which case, mandating a 4th O does something is problematic; or we allow reasonable variations depending on resources, in which case why can't we have a stop clock (and indeed, VAR, reserve AR's etc) in matches where resources allow it?
With respect to your second point - referees are human and make mistakes. The referee could say 3 and the 4O hears 4 and shows that (or any other pair of numbers that might sound similar in other languages) - is the referee then obliged to play an additional minute they didn't want?
Or the referee could mentally tot up the stoppages in the second half and accidentally allow 2 minutes for an injury that was actually in the first half and was included in first half stoppage time. Again, on realising that mistake, isn't correcting it better than playing more time than is fair and potentially allowing the result to be changed?
