You should probably just get the RV-500 and MD-500
I do like the RV500, but I feel like the Hall doesn't quite sound as good as the RV-5. But maybe I just need to give it another go! lol.
I've never used the MD500 tbh!
I feel like I should define what I mean by minimalism.
For the last ... 10 years... I was primarily using Helix for effects only. I had a preset per-song. I did whatever I thought the song needed at the time. This resulted in a lot of variation and a lot of different tones, which was cool. But at the same time, I felt like the 'signature' sound I had going on previous albums, was kind of lost.
The whole "one preset per song" with snapshots ... that way of playing... it just got to me after a while. I felt like I wasn't 'me'. I thought it was to do with the effects quality, but it wasn't. I got a GigRig G3 and a bunch of pedals and I had ambitions of making a huge spaceship board... but again... I was just losing something.
I had a few practices over the last year and a bit, where I just went back to an amp footswitch and separate pedals. No effects looper footswitch, no midi, nothing complex.
And every single time I've done it, regardless of what I used, I've had a shit ton of fun.
So for me, it isn't really a case of 'fewer pedals' but more a case of 'simplified workflow'