That's true good points re:Canada. I am not sure they are a pair power house but they have had some success. I would not compare them to Russia, China, and Germany even but they do make a stand. I was obviously focusing on more of the Russia China training ways. From skaters that have broken free of those countries they tell some interesting stories. Some of them benefit the discipline some are nuts. You also pointed out how Canada is even different adding Dance at a young age. That is interesting and not something many could afford. Affording pairs and singles is a lot. Adding dance with a partner would be another expense. There are issues was my point. I think it is pretty obvious there are. That said I do feel like USA can break through like Canada has. If they can USA can.
a few points :
History (Olympics only) of pair skating... truly, if we look at the modern era, Russia under different banners (Soviet Union, Unified team, Russia) has been the only real powerhouse in pairs.
They have won most of the Olympic titles.. often had 2 teams on the podium, and were only ousted of the podium once, in Vancouver 2010.
Not only there is tradition with Russian pairs, a tradition that seems to be based on ballet aesthetics, but the federation did invest a lot on pair training over the years.
China, has only won its first pairs medal in 2002.... so pretty much, before IJS were on the podium only once in SLC. The longevity of their athletes is also important to mention... 3 of the 5 medals won by the same pair... Also, they have a federation controlling the sport, to the point that they even control partnerships (swap gate)
Germany has had only 3 medals since 1992.... all bronzes... 2 of which came from S/S.
Canada also 3 since 1992, one gold, two bronzes.
USA has never won gold in all history of pairs at olympics... and since 1992, 0 medal.
So, outside of Russia, we see a clear momentum with Chinese pairs, but it's very recent and should keep going until at least 2022 (games in China) but if there are often 2 or 3 strong teams, there is very little below these teams...
Germany is still alive because Aljona is keeping going... but there is not much legacy at the moment.
Russia right now, is rebuilding yet still potentially able to medal at the Olympics.
Canada has 4 strong teams, a good middle pack of developing teams (most newly formed partnerships) and some strong juniors on the JGP.
The issue with USA is that there is NO REAL DEFINITE #1 team right now, due to injuries and newly formed partnerships...
The Germany of today, Canada and USA probably have similar training models... not unlike other countries like France and Italy but the way to the top step of the podium is very difficult for all these countries...
So, YMMV but outside of Russia and recently China, I don't see how Germany is a powerhouse... when it's pretty much one skater who is running the show.

(and doing so now with a French partner)
Now... what SnowWhite was telling you is not quite what you seem to have understood.
Many Canadian skaters do not do pairs as kids.. they do SINGLES and DANCE... so they learn how to skate in unison with a partner, do dance lifts, dance/pair spins, footwork, and of course, in singles, jumps....
So, what happens is simple, some skaters at a later age, make a decision and chose ONE discipline... and this is where PAIRS becomes an option. We have a few skaters on the JGP who are doing dance internationally but are still strong novice or junior single skaters... and same with the opposite scenario. The model is to develop well-rounded kids, who then, if they remain in singles, will have good skating skills from dance, if they remain in dance, will have trained from a young age, and if they feel interest and potential for pairs will have strong jumps, spins and skating skills, but also have had partnership experience.
That's what SnowWhite was saying. Skaters here chose pairs often after training dance and singles... and that's why, without a pool of skaters as important as what there is in the USA, I would think that Canada is still a factor, year in and year out in that discipline. Canada may not challenge for medals all the time, but often has their teams rank in the top ten.... at US Classic last week, Canada's #4 team, beat all the US teams present. It gives you an idea of the depth in the middle or top ten range, if at times, there aren't real contenders for Olympic gold.
And sure, I left out WC from the historical background to save some time... and there is no denying that S/S made their mark there... but so did D/R for instance... but I thought looking at Olympics, because that is the final point of the olympic cycle which athletes train for... was more relevant
YMMV