Case in point, does MTG have a rule about how many rounds you are allowd to play before initiating an attack? You know it doesn't.
If you're deliberately taking repetitive actions which don't help you win the game, with the clear intent of reaching the time limit before the game can end, you can expect a slow play penalty. And you're going to get it even if the individual actions are done at a reasonable pace.
Many aspects of X-Wing may be similar to Magic, but not in regards to the situation that the OP describes.
There are ways in Magic to pad out a turn and effectively 'do nothing'. Magic is a far more complex game than X-Wing will ever be. Magic has infinite loops along with other convoluted sequences that can take a while to resolve. Think of the 'Eggs' deck that got nerfed in Modern... each turn would take ages to complete. Magic does have provisions for players to 'advance the game state' and failure to do so may result in warnings.
Flying defensively is not stalling (provided that the player is progressing through the turn sequence at a reasonable pace) and can not be compared to any similar situation to Magic. Every turn the A-Wing player is setting his dial and moving his ship. He is advancing the game state. At some point he will need to hard turn away from a board edge, or K-turn back into play. It is then up to his opponent to capitalise on that window of opportunity to engage. The geometry of the play area ensures that ships must engage in future turns. You can't run forever!
This thread demonstrates why it might be useful for TOs to have access to common definitions and examples of what FFG deem to be (not)/acceptable. It's been debated in other threads about the merit for some kind of FFG 'Judge/TO' program. We can see how easy it is for some opinions to differ about a very simple, valid game tactic of flying defensively for a timed win.
If the OP played at my tournament (with me as a TO) he would be congratulated for good, intelligent flying.
If the OP played at iPeregrine's tournament (with iPeregrine as a TO) he might be DQd for stalling...
There's something not right about that inconsistency.
Edited by TezzasGames