There are about a million infected individuals right now, and climbing, and each hospitalised patient in ITU may need these procedures several times a day. An ITU team performing the procedure might consist of 2 to 4 people and the shields should be discarded every time. The number of patients is also rising rapidly, so demand is very high.

When you see doctors and nurses in full scrubs with face shields doing their shopping, then you know you need this equipment. However if you're really concerned there are other options[0].

[0]https://www.amazon.com/Sinoocean-Astronaut-Spaceman-Costume-...