Their engines were really easy to start in cold weather.
I'm not sure I'm experiencing anything unique about the Tecumseh engine in terms of starting. I don't see it as being easier than the rest. All my engines, even the Chinese Honda clone on my Toro is easy to start.
Although I'm developing a liking to the sound of Tecumseh flat head engine. Just a raw and rauscious sophisticated brap brap. Annoying sound at 6 oclock in the morning, but sounds just perfect muffled by a deep blanket of snow.
Now, the Stihl 4 mix engines on my string trimmer, on the other hand, that is a pain in the arse to start even in the summer. Runs and sounds really good when it does run. Although I frequently curse German engineering. :) Runs great, pain to work on.