"I suppose the next big update will probably try to convert back to apfs which at this point is rubbish in my opinion. Anyone got any insight here? So far this thing runs great!"
Heh.
If it's "running great" in HFS, you could leave it there
In fact, right now as I type this reply...
I'm setting up my new 2018 Mac Mini which arrived a few hours ago.
However, this is going to be perhaps the only 2018 Mac Mini in the country that DOES NOT USE APFS.
It's going to run HFS+ instead, just as did older Macs.
The internal drive has already been erased to HFS+, and as I type I'm cloning a copy of Mojave (from an HFS+ drive) to the Mini's internal drive.
Result:
Mojave running on HFS+ from the Mini's INTERNAL drive.
EDIT:
Just as I was completing this reply, CCC finished the HFS+ clone, and created an HFS+ style recovery partition as well.
Next step, after I post this, will be the moment of truth:
Will it boot?
EDIT #2:
Yes, it did!
How many other owners of the 2018 Mac Mini have theirs booting and running (from the internal drive) using HFS+ ???