This statement is incorrect, 15" designs handle the 100W TDP just fine. Look at the Dell XPS 15 - it has an Intel H-series CPU (45W) plus a 1050 GPU (55W). While having all this power, it's slim and the cooling solution works OK under load (less reports about thermal throttling than latest MBP has) and with a 130W power brick it can be powered no problem unxer full load.