There are no major point about Pads and Smartphone throttle, since it is a basic fact. If you run high performance software on them, they will get hot and then automatically turn down, so that they don't overhead (unless you have a Galaxy 7). This makes sense, since those devises are not primary gameing devices.
Digital Foundry talk about that in there YouTube video about the Switch specs and why they assume, that the Switch is underclocked in comparison.
Also the Switch patent didn't show a fan in the inside, that is one of those big questionmarks around the mobile console.