Wall perk?

What's the point of this? Isn't it just a nerf to her walls? 95% of time I drop my walls early and if it's useful for it's entire duration it's usually already been broken by the time it drops naturally. All this perk does for me is increase wall cooldown by 2 seconds. It's so incredibly niche that there's never any reason for me to take it over greater ray range (which is also lackluster since icicle is generally a better killing tool). What is everyone's experience? When have they found it useful?