Her wall got nerfed a while back, so that upon deployment it would have 400 health, and after a few seconds if it were not being attacked it would go back up to 800. This addition was said to punish reactionary use of the wall and to encourage Sage players to decide strategically which place is the best for the wall as a precaution, not as a reaction.

Then they removed the ability for her to place it before the round begins?

This makes precautionary use of the wall hard as in the beginning of the round it is up to luck whether the enemy team 5 stacks onto the site where you are placing your wall or if none of them are coming, and this decides whether your 400 HP wall will be broken in seconds (even though you placed it immediately at the start of the round, meaning that it is not a reactionary play) or it will survive. 800 HP should always be attainable if you are using the wall as a precaution.

I just want to know why they did this, some are saying that the developers are too lazy to fix that glitch with Omen teleporting outside of his spawn but I don't think that's true, there has to be a legitimate reason why they're keeping this feature in right? And if so, does anyone know why?