The laptop I referred to in the other post (Dell Inspiron 15 7000) was indeed bought in Australia through Dell AU online. Dell AU also have the XPS models though limited to 15.6" screen size. It doesn't look as though there are anywhere near as many 17" laptops any more, so you may be limited to 15.6" in a laptop. Officeworks online only has 2 17" laptops; HNs has lots more but some are brand names I've never heard of and seem to be aimed at gaming.
This also jogged my memory that around a year ago re a similar question on this forum, somebody suggested an HP Spectre x360, I think it was. It is available in Australia in either 13" or 15.6" screen sizes, but they are quite pricey. The following link is to HP AU's website re this unit:
MSI is one of the brands stocked by Harvey Norman (and MSY Computers for that matter), so it may be worth exploring those avenues as well. Personally, I have no experience with or knowledge about MSI, though I would be a little cautious about the unit that you've highlighted. The reason being is that the i7 7700 is a 7th gen Intel core - the most recent Intel gen is now 9.
Many months ago while considering a MS Surface Pro, the units at the time only had 7th gen Intel even though 8th gen had been out for many months. During a Google search comparing gen 7 to 8, I found a few comparison sites identifying significant performance improvements in 8 over 7, especially in regards to 4K video editing, so I decided that gen 7 was not for me.
Even though desktops are much less popular than they were a decade ago, it may be worth it to explore a desktop if you really don't need a laptop edit machine for travel/portability. My main edit computer is still a desktop - a 5 years old Dell XPS which has had quite a few upgrades during those years. And therein lies the advantage. Desktops usually have extra bays to add additional HDDs - it's often recommended to keep video/audio media on a different drive to the OS drive; its much easier to upgrade or add video and audio cards; and the monitor can be upgraded as well (though that is also possible with a laptop using the external output, usually via HDMI). Of course, laptop or desktop is very much a personal choice.
Why on earth would you want to spend $2500-$2800 on a laptop just to run a NLE, I purchased a Dell Inspiron 7567 (see signature for specs), this unit cost less than AUD$2000 including a 3 year service package.
I have 3 NLEs installed have no issues editing full HD or 4 K video, I have never found it necessary to invoke Smart Proxy and have not had issues with jerky playback or any type of slowdown.
Those more expensive units are for Gamers not video editors
An NLE means non-linear editor which is what Movie Studio is
Dell Australia have some great offers at the moment for the Inspiron 15 7000 series of laptops and I believe the G series.
As far as rendering is concerned, How Long is a Piece of String, whether or not you can continue working whilst rendering is in progress is totally dependent on the content of what is being rendered.Rendering is very CPU intensive, so the more filters and text used, the more CPU usage required. I have carried out other work whilst rendering is being carried out, but only when reasonably simple projects are being rendered