It has not hurt anything in this past year. We have officiated and been able to control the very same things we did before.

Peace

Sorry that was me interpreting what it may look like. It does say "defensive matchup". Either way I don't see why it's still a rule.

Simplified explanation of Grinnell style (sometimes called 'The System') is subbing 4-5 players every minute or so to keep players fresh so they can face guard full court press to wear opponents out.

Confused In Middle School ...
 

Players at the middle school level and below can often get confused when playing man to man defense and a lot of opposing substitutes are beckoned.

It's not a big deal. You probably do it now without an official request from the captain and don't even realize it.

R: [beckons 3 subs from H], waits for subs to enter and replaced players to leave, points to partner to put the ball in play.
V-Captain: Wait a second sir, we want to make sure we are matched up properly.
V-Cap (to teamates): I have 12. Who has 15?
V20: I do.
V25: I have 32.
V-Cap (to official): Thank you. I think we're ready.

Hope this helps.
 

Grinnell is a college in Iowa at the D3 level (Midwest Conference) and they run 5 subs in like every minute. The goal is to play everyone on the bench for the most part and shoot the ball within like 7 seconds of the possession. A lot of threes and a lot of up and down basketball. They can easily score over 100 points and often play little defense because the goal is to outscore you and wear you down. Some times try to play with them and others try to slow the ball down a little to control more of the tempo. I have had the opportunity to officiate Grinnell, but there are a few schools that used this system at the high school level. There was a team in the south suburbs that ran this system and he was a coach that played at Depaul and happened to send like two sons to the Grinnell program. I think I was on a game where they set the state record for 3 point shots and makes in a game about 8 or 9 years ago.

But all that being said even when this system was used, there were programs that never asked for match-up requests. So it is really not a very widely used rule and certainly not used at that level.

Peace

Politically Correct ...
 

Person to person defense?

Ah, thanks for the clarification.

Because coaches still want the rule in place?