Although the timber could have been floated down the St Lawrence, I have changed my mind about local farmers selling wood to Europe but their would have been a local market for wood
It makes more sense Europe got their wood from the coast until the canals were built
So it was the voyageur canoeists that brought the European goods to Toronto through the St Lawrence ??? They paddled upstream with a load of cargo?? and portaged around the rapids until they transferred the freight onto a great lakes ship once they got past all the rapids ???
Actually, it makes sense to build a road around all the rapids with a port at both ends
A simple dirt road 50 miles or so long should not be that difficult to do with a organized work force then horse and wagon could do the carrying
They got European goods here before the canals somehow
If you want to make money, or justify spending it you don't build a "simple dirt road". A good road, even a simple, unpaved one is not a simple build*. You're quite right that primitive roads around rapids developed early because it's where they were needed. As always in human endeavour, they were a set of compromises between what they wanted—no inconvenience at all, which would be an all water route, or a smooth surfaced, flat road somehow paved to hold up to weather and traffic, but even primitive macadamizing only appeared in the 1820s— and what little they could afford at the time. Good roads were rare even in Europe, and still built and maintained with forced labour until recent times. So improvements came little by little and always later than wanted. Like a subway to Scarborough.
And then there's that "organized workforce". If you have no existing population, and are trying to attract one by giving away free land where does that come from? Research and look up the Berczy Settlement; you must have wondered why there's a park named for Berczy at the bottom of Yonge. They chopped trees along the route north as part of their deal, but a long time and a whole lot more slow and expensive work was needed before wagon traffic up Yonge was anything 'simple'. None of this was 'simple'. Nor was anything ever static, prescribed or unchanging. As soon as some difficult challenge was overcome it just revealed the next and revealed the shortcomings that were being left behind for the next folks to deal with.
And then the Yankees invaded and the menfolk had to down tools and go to war. Or there was a Depression, or a year with no summer, or some fool leading a Rebellion, or …. But there was still always the push to accomplish just a bit more. So that opening between the boulders became a path that became a portage that became a track that became a sorta road that got gravelled eventually and now is a forgotten lane because the TransCanada passed to the south, and as you speed on the 401, you don't even know where the TransCanada was. There never was and never will be one single How It Was Done unless you want to name one single day. It's always been What Do We Do Next.
I really wonder why you're just thinking about all this fascinating real-life stuff that has shaped everything about how and where you are living today and why you're 'changing your mind about' it this way and that? It's easy and fun to research in all sorts of books, and like sitting down for a banquet, when you next stand up from your reading you'll be satisfied and fuelled up, at least for awhile. Mental gymnastics in the abstract may make the mind more supple and easier to change but they can never answer a question of fact about the past, only improve the guesswork, though you might look up York boats to switch your guesses from pictures of little birchbark canoes with a couple of voyageurs to paddle them, as a warm-up exercise.
http://www.hbcheritage.ca/images/Canoe.jpg and
http://www.hbcheritage.ca/hbcheritage/history/transportation/yorkboat/
At four pages on my browser and still growing, clearly this thread is entertaining more than just me, and I thank you for it and the pleasure your interest and curiosity continues to provide.
*Wikipedia will show how complicated a 'simple' Roman road built primarily to provide passage for marching men and their baggage needed to be. Anyone who's tried driving on dirt without a built foundation, even with big soft tires never mind narrow iron-shod cart wheels, knows how the slightest dip filled with water forces a detour that widens the dip and forces the next vehicle into a wider detour, until the 'road' becomes a corkscrew steeplechase. Roads are never simple, What's simple is expediency, and that always changes.