It depends on the aim. For castability Xel'Naga does get boring yes, but as far as balance goes, especially in Bo1, having the most fair map as the only map is the only choice you have. Even if you pick Meta as an alternate map, a Zerg can get close spawns with a Terran and could lose to a player they are better than due to map inbalance, then all of a sudden you have to ask 'Did the best player really win?'
maybe alternate with modified shattered and metalopalis. The TSL ones with no close spawns. Woulda add variety without compromising balance issues
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