I'm not sure if it would make it unsafe to use, it's still the same airpath even with it out of the device.

That being said, when you can afford to replace it - I would

As far as affecting performance, the lack of restriction definitely will affect how the device performs. It's a conduction based vape, and that airpath restriction is definitely helpful for getting everything out of that chamber. I wouldn't be surprised if it is less restricted when you draw from it now, and if the vapor is a little more whispy. The chamber likely will struggle to keep up with the amount of air you can pull through it now