In 40k, this would be like the much more popular Space Marine player complaining that the Tau player refuses to engage them in close combat.
No, it's not at all the same. The Tau player is refusing to fight in melee, but they're continuing to shoot the space marine player to death and win the game on their terms. The running away a-wing player has no such chance to win without the time limit. It isn't the evasion that's the problem, it's the use of stalling to prevent the match from finishing within the time limit.
Why can't a cat-and-mouse game of careful positioning be just as enjoyable?
Because it's not a cat-and-mouse game of careful positioning, it's a game of "take as long as possible to execute my time-wasting turns so that we reach the time limit before anything that might involve a risk of losing can happen".
Edited by iPeregrine