Hello Eivind,
Thanks very much for the interest in upgrading. Audio is routed in the same way in v7 as v5 (except that there are now 128 mixer presets, and you can switch between the in real-time), but there are several enhancements that make the mixer and routing screens easier and quicker to use and visualise. The v7 release notice covers them in depth:
https://www.hauptwerk.com/documentation/
I think you would find that they do help significantly.