Very true. I did some research before buying the Clazzio covers. I can personally verify that the airbags deployed just fine.
https://www.clazzio.com/blog/clazzio-seat-covers-faq/
I really wish I did. I should have taken before and after photos. My FJ was totaled back in November (which is why I am now waiting on my BS). By the way, the airbags worked just fine ;-)
Also, I will say that I also ordered their leather seat covers. They installed right over the heaters and my old seats. They were awesome and looked like they came straight from the factory. So, I did not do any removing of the existing covers to insert the heaters. I am certain that doing that...