Okay but the gates are at the extreme ends, what are the chances a teamfight will take place near it. Also the tree layer looks to be extra thin at those places so enemies can just decide to take the normal entrance beside it.

On the vision thing sure, although inside the base the path has trees to limit vision of the base anyways.

Overall the blocking area seems too small and I am not able understand why retreating heroes will get the chance to take that route, and even then enemies would take normal entrance nearby if they think its safe. Alternatively I guess if an enemy were to force staff or blink in there, they would have to escape back through the normal entrance so there's that.