Warhounds can be incredibly annoying pressuring a 1gate FE, commonly picking off multiple units and sometimes workers.
Having LosB close to the natural would allow gateway units to move out and repel warhounds. Zealot sentry could just ff and kill a warhound as soon as it shows itself while you wait at the LosB.
There won't be air vision for a long time unless terran wants to waste a floating building.
Just another way that maps can adjust the game and compensate for faults.
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Obviously this does not address any real problems about warhound as a unit, just a small thought I wanted to share.