I agree earlier that items place a handicap, but I believe they present a handicap to the better player, especially in a competitive scene. Lets look at Player A and Player B: Player A is the #1 ranked player in the world, Player B is the #2 ranked player in the world. Both players main Marth, so we know there is character balance in their matches. Both players play equally well with items on or off. Now lets look at tournament results of this.
Tournament 1 – No Items
There are ten matches. 9/10 matches, Player A wins. Player A doesn’t completely dominate these matches, but as the slightly better player, he wins almost all the time. The games almost all end with Player A at one remaining stock and about 50% when he finally delivers the finishing blow; only exception being the one game where Player B really stepped up his game and was able to raise that % from 50 to the final KO. We can determine from these results, whether the tournament was best 2 out of 3 or 3 out of 5 (I’ve never seen tournaments go higher than 3 out of 5), that Player A is the better player. Now lets look at Tournament 2.
Tournament 2 – Items
Same players, same rules, only items are on this time. The results change, however, to 6/10 matches for Player A. Player B won round 1, round 3, round 5, and round 9.
Round 1 went as any round in the No Items tournament, yet at that final stock, Player B, while caught in a combo that would normally lead to a KO, gains invincibility from a Star and is able to utilize this to take the stock and win. Both players are top end players. You may try to argue that Player A should have dodged better thereafter, but the fact you try to force on us is that both players should be able to fully utilize what is given to them. Both of these players can do this, so it came down to which one of them was lucky enough to receive this benefit. Invincibility just happened to be a large enough advantage to decide the match.
Round 3 also goes the same, but halfway through the match, Player A, while swinging at Player B, gets hit by a newly spawned Bob-omb. This loss of a stock destroys Player A’s usual one-stock advantage. There was nothing Player A could do to stop this loss of stock as he could not dodge mid-swing.
Round 5 is seemingly fair, but is much like the round in the No Items Tournament; no random, game-breaking situations occur. Items spawn in fair conditions, but Player B is able to step his game up and take this match.
Round 9, on the first stock, Player B, while performing an aerial combo, realizes he has caught an item. Player A, being as quick as he is, realizes an item was caught. Since the spawning and catching was so quick, neither player knows what the item is before Player B throws it. Player A, knowing an item was thrown, but not knowing what was thrown, responds by spot dodging. While a spot dodge would avoid many items in this game, Player A got unlucky and this item happened to be a Smart Bomb, and is then caught in the explosion and KOed.
As can be seen, the results of the items tournament do not seem as fair. Player B still had his game where he was able to step up and win, and Player A still won a majority of the matches, but 3 of the matches went to Player B due to random occurrences. Since occurrences like these are RANDOM, and probability doesn’t follow set rules, they could have occurred in any sequence of rounds. They are just as likely to occur in rounds 1, 2, and 3 as they are to occur in round 5, 7 and 10. They are also just as likely to not occur as they are to occur. If they all occurred in rounds 1, 2, and 3, this would make Player B seem completely dominant in a 2 of 3 or 3 of 5 tournament. If they occurred in matches 5, 7, and 10, Player A is still going to get his rightfully deserved wins, with Player B possibly getting that round where he is able to step up and win.
Items, while not always, WILL have their moments where probability dominates skill. These moments are not welcome in a competitive scene.