I've had the windows serving as a back wall for decades. This is my fourth house with this arrangement. I have used either Levelor blinds or minor room treatments with plants to dampen the brightness. All I can say that it worked for me and I like a lot of natural light. Then again, I've never had a dedicated room and my system has always been in my living room. My avatar is a picture from my previous house.
Brightness isn't really too much of a problem here, my issue is that, as a bassaholic, I know i can instantly improve the bass performance of my system by moving it around 180°.
I just wouldn't accept that compromise in any other area
Newest addition is the Aries Cerat Talos SUT R4. A custom setup up transformer box with 4 inputs and grounding for each input. You can lift ground with the center switch and control which tonearm to use via the knobs on the top. So a one input phono can become a 2,3 or in this case 4 input phono. This configuration uses a single step up ratio for low output impedance carts, but can be configured with different step up ratios for each input.