Guten systems have been in use now for years with the power control built in. They're absolutely fine even in the 'hot ambient temperature' because they were designed to function with that feature in place. But the money you're saving by not having a power control feature and instead just milking the nebulous concept of low watt density has got to be great for you but miserable for the control you're offering your brewers.
It sounds a bit more like you guys are resentful that you are not making as many sales as us. The reality is many more BrewZilla units are sold around the world for a reason. How about we test your boards and our boards in a public video. We will do load testing and heat tolerance testing. What do you say?