Difficult maintenance? That’s a weird claim. Cube uses standard bike parts and AFAIK does not rely on any proprietary standards. They are no easier or more difficult to service than other bikes.
I have had three Cube bikes, two mountain bikes and a road bike. I was/am very happy with my mountain bikes, especially my first one (a hardtail). My road bike’s geometry is too mellow for my taste, and my next road bike will hopefully be the 3T Strada.
My mom’s commuter is also a Cube, which has been very dependable. (When I was still living in Munich, the closest good bike shop was mainly a selling Cube bikes. I am not a fanboy for the brand. My last Cube is a giant coincidence: I currently live in Japan, and Cube’s presence in Japan is tiny. Apart from my own bikes, I remember seeing only one other Cube bike on the road ever.)
In any case, I still suggest a bike like the Cube Hyde might be the right solution for you. If you find one, test ride it to see if you like that style of bike, no matter the brand. And test ride all the other cross-type bikes, e. g. road bike derived flat bar bikes, MTB-derived drop bar bikes, everything. You will find out quite quickly what you like and dislike.
For example, I have had the opportunity to try hub gears during a business trip to the Netherlands and I hated how it shifted. Personally, I’d rather go for a 1x gear train with a traditional rear derailleur. But if you get along great with hub gears, the combination with a carbon belt drive is quite the combination.
