I split my /home partition off from the root - separate drives, in fact. This helped save my bacon (I posted elsewhere here if you want to read about it). Basically, it allowed me to "upgrade in place" by using a new drive for the OS, after I totally fubar'd my 14.04 LTS (long-in-the-tooth) system...
Ubuntu could try to make things clearer - but one would think that "LTS" would be clear enough. "Long Term Support" - and they give enough other warnings about things...
I've been running Linux in some fashion since 1995; if installing Ubuntu isn't easy enough, I don't know how you could make it much easier (that said - my latest install was Ubuntu Budgie 18.04 LTS - and that was probably the best install experience I've ever had).
They should be just “Ubuntu 18.04” but “Ubuntu Preview 0.1810”, “Ubuntu Preview 0.1904” etc.
The non-LTS releases are really not for everyone, and should not even attract the normal users with the "bigger" number. They should really warn the "normal users" that only 18.04, 20.04 are somewhat "safer" for them (I've personally had significant problems with 17.10 which used "wayland" as default even if a lot of applications just didn't work correctly under it, then 18.04 thankfully changed that default. And even 18.04 had initial issues which were removed only some months later -- so who wants less issues shouldn't install 20.04 before, let's say, September 2020).
I've also actually tried to keep up with upgrading every 6 months, and it's... such a waste of time when something breaks... and it will. Once the breakage was such that eventually the answer was "oh, you upgrade in place? We don't test it much like this, you should back up your home partition, install clean, copy back your home partition, then it will work."
That being said, given that I haven't paid for it, except with my time, sometimes the price is right. But sometimes, once can actually decide to trade money for the time spent debugging the OS... unless it's just about programming. Linux has some advantages there.
Additionally, to me it seems that KDE is still easier to use, so most users should start with Kubuntu and only LTS.