I'm totally fine with stalling. After all, it's just a tactic like any other. The game doesn't revolve only around agressive play since a lot of the characters simply don't have the tools to rush down. Do you expect a Villager, a Toon Link or a Duck Hunt to simply go in and try to win with A moves? Do we want to ban certain characters just because of their campy nature? It's not all one dimensional, it was made with the intent of having different playstyles, and camping/stalling is one of them. The inclusion of the timer and the absence of Sudden Death in tournaments reinfroces that: it gives the possibility of stalling to players who want to, while still keeping it reasonable and pressuring the other player to do something. I don't see how it is any less valid than any other playstyle.
There's a difference between spamming and stalling. Spamming is generally bad and easily punishable. If you lose because the other player keeps repeating the same move over and over and you don't know how to adapt and counter it, it's your problem and you deserve to lose. Don't blame the other player or the game for it. If you lose because of smart stalling, it was a fair game, so there's also nothing to complain about. It just means the other player was better at keeping his distance and being safe than you are at pressuring. He's the better player, he wins.
I get it can be frustrating to play against because it's slower paced, but if you learn how to do it, and realise how much depths it adds because of all the mindgames going on, it's as much if not more fun than a normal match. It's exciting, because it forces each player to play perfectly. The player who is stalling has to take the best decisions possible, or he's going to get hit and lose his advantage. The player trying to hit him has to really think of what he is doing, and he has to be ''smarter'' than he usually is if he wants to gain back his advantage. There's a lot more tension in a game like this. The Dabuz/Abadango game at APEX is a perfect example of this; each player was really struggling to keep/get the advantage, and I think it was a great game.