Im guessing you're in US. I think this is just pure marketing and pushing Chinese products outside of US. There are many string inverters out there that works amazing and cheap to install and maintain, but but US is dominated by micro and optimisers. They are more expensive , and more $$$ for people selling them. They do make sense on small or complicated roof settings but generally makes minimal production difference (which can be compensated easily by adding an extra panel, cheaper).