Hi,
If your really going to use the bike for 90% tarmac, then the bike is perfect, it does the easy trails, and old railway lines with ease.
I have got fully used to the hub on hills, on or off road. Just need to think about what point to change down, if going gets a bit steep. On a road, or soft trail, this is never an issue. On a steep trail, with rocks, roots etc, you may go over a root, at the exact point you have to stop pedalling to change to the low gear, this may stop the bike. No issue, you get used to changing down earlier, if you see a tricky bit coming up.
The reason why "I" would buy something different, is when I bought it, I though I would be 90% road and soft trail, tow path, railway line.
It turns out, that there are a LOT of hard trails, steep hill trail sections, that I can now do now I have the assistance. I would never have discovered them, or gone anywhere near them without an electric bike. I needed the electric to discover them, and now I have, I know that full SUS is the right thing for the terrain I now ride!
Hope that makes sense, chicken and egg really.
I just ride the cube within its capabilities, on all terrain, yes, the back wheel spins in the mud, and I have to go slow down hills, but nothing stops me, so im still very happy with the bike.
Geoff.