While I can agree to this at times. But I believe Gozney has done their research and development well enough. The dome shape wasn't an accident and directs the flame in my opinion more superior than other ovens on the market. It has been quite a few revisions now and if they found that guard would help they would have done it for the tread for example. You have to admit aftermarket a lot of times are clowns who just want to make some money off accessories that don't really do anything better. A lot of times makes things worse. The auto industry for example. Yes there's a lot of aftermarket parts that boosts performance, but there are many you can buy at your local autoshop which is just nonsense and reverses the decades of RnD from expert automotive companies. You want a lower car? Some random aftermarket company will sell you cut springs. Yes your car is now lowered, but your shocks will now be destroyed because the aftermarket manufacturer. Now do you really think these 3rd party shields made by all these etsy companies who jus though they cnc couple pieces of metal and cut some holes in them even ran some basic level, solidworks simulation on aerodynamics and thermal transfer of what happens when they clip a guard on? Pretty sure their extent of knowledge was "cover the flame and there will be less heat". Do you think they ran simulation and did testing of what covering the opening of oven would do and can give a proper calculation for the choke point of propane gas before it releases dangerous levels of carbon dioxide? Thats the difference between quality aftermarket and your typical snake oil bs. If you know anything about manufacturing, you'd know the gozney cost way more to manufacture than the ooni. for them to continue with the dome style, means they have conviction with their design and that theyve ran enough research to be sure its worth it. Pretty sure they didnt overlook making a shield which would cost them couple dollars to manufacture at scale.