There is no "higher level of technology" needed because the technology needed to colonise those areas more extensive is already available today (and yesterday, something like the new Russian icebreaker Arktika could've easily been completed by the late 90s) It's all a matter of logistics and how much comfort people are demanding. The hardy Soviet Man made do with far less in Russian Siberia and was also effectively force-migrated through state programs Canada or most democratic nations wouldn't dream of doing. At least not if you weren't indigenous, like when they "relocated" Inuit families to remote islands. As for what logistics? All you need are icebreakers, more roads, and more ice road truckers and a government bank account willing to subsidize colonial programs that are destructive on the environment and absolutely needless. If you had a "higher level of technology", you're still out of luck, because said technology will just make the rest of country even more efficient and still won't require all sorts of new roads, expanded ports, and above all, colonists.
Just look at cities like Yakutsk. 300,000+ people and built on permafrost in one of the coldest environments outside of Antarctica, founded in the 17th century, with most of its growth in the 20th century. No futuristic technology needed, just human willpower.
There's a huge difference between settling, say, Kenya, and settling the frozen wastes of Canada. It's far more profitable to rule over Kenyans and send in the white settlers on the side to the highlands while there is barely anything to gain out of the frozen north aside from its mineral wealth and secondary concerns like hydropower.
No comparison between Inner Australia and Central Asia/Middle East. Different environment and far more empty than those places in terms of native population thanks to massacres and epidemics. Again, "higher technology" is useless when it's been colonised to about as much as politics will allow. Why do any of these places need millions of people to count as settler colonies?