I am going to quote Cyrus here, but the first part of my post is going to be directed at those who share the same sentiment.
That is understandable, however it really isn't a player's job to keep track of their opponent's slow play. Sure if you think your opponent is playing too slow you could ask them to speed up, but that doesn't always solve the problem, besides your opponent may not even be slow playing/stalling, you may just think they are. Whether a watch is or is not worn/used by players, players do not have the authority to state "my opponent is slow playing/stalling", the only ones who have the authority to state this is a JUDGE. The only thing players could state is "I think my opponent is slow playing/stalling", the next logical step for the player is to call a judge to watch pace of play. The fact that you were wearing a watch does not help the judge make the determination of slow playing (or in some cases possible stalling). A judge will have to watch the match for a turn or two to make the determination.
There does exist an alternative for the watch to help players formulate an opinion about their opponent's pace of play. A quote from the slow play section of the Judges Manual
Judge Manual- "Unobtrusively time the player's actions (don't hold up a stopwatch;
instead count silently or observe a room clock or wristwatch on folded arms)".
If a player is citing the use of a watch to help them keep track of their opponents' pace of play, there is NO Reason what so ever they can not silently count in there mind "1 1000, 2 1000, 3 1000, etc...". Judges are encouraged to use count silently in their mind why can't players do it as well. Even if you choose not to count silently you some times get that feeling... "man my opponent" is taking too long. Whether it be just a feeling, a silent count, or a watch timing your opponent, the result is the same; a player thinks/feels their opponent is slow playing- all three will cause the player to: speed up their own play so they won't be put at a disadvantage, ask their opponent to speed up or call a judge to watch pace of play.
Even if the purpose of wearing a watch is to track an opponent's slow play, there is nothing preventing the wearer from slow playing/stalling themselves.
The difference between using a watch is counting silently in your mind is players that are using the watch know when exactly time is is going to end and +3 turns begin. I think that is the big issue here, STALLING! If a player with a watch can time it precisely (taking a fast turn here or a slow turn here) so their opponent is Turn 0 and they are Turn 3, they can put them self in a better position get ahead on prizes for turn 3. This is STALLING, that was made possible by use of a watch. To preserve the integrity of the game I think watches should be disallowed so players are unable to use them to stall.
Slow play and Stalling will exist whether or not Watches are allowed to exist of not. The argument can be made that there does exist legitimate uses for wearing a watch during game play, however anyone who is citing these legitimate reasons can not deny that stalling can arise from using a watch. I do realize that most players will not try to stall by using a watch because that is the type of community we are, however the potential for abuse exists.
For those that have been playing for years recall that Foreign Language cards and autographed cards/cards with writing on them use to be allowed, there was room for abuse, and the Tournament rules were updated to disallow these.
Look at our current rules regarding sleeves and randomizers under older copies of the Tournament Rules. the rules on these were not always this strict and spelled out, there was room for abuse, and the rules were updated to prevent abuse.
Watches are no different, allowing them leaves the door open for abuse. If this type of issue arises and a player gets caught/accused of using a watch to stall, a judge is put in a position where they may have to issue a penalty as high as a DQ. I think everyone here (players and judges alike) can agree that any given tournament game needs to be decided on the table and not influenced/decided by a penalty. As a judge myself I know I would not want to be put in a situation where I need to make a tough call about a player abusing a watch when the call could of been avoided by disallowing watches in the first place. Judging 101- Fix Problems before they occur.
tl;dr- Agreed with Ryan 100%, I am all for disallowing watches.