My experience with Fractal mirrors yours. My Define R5, about eight years old, has housed Intel Core 2nd, 8th, and 12th gen builds. It is by far the oldest part of my primary gaming PC. It has no RGB, it’s well constructed, and it’s laid out with sound design principals that other good case manufacturers have now adopted. It’s been a joy and I don’t foresee replacing it any time soon.
I’ve considered upgrading it during each board swap. It’s currently housing a 12900k build and it does choke the cooler a little, but only a few degrees. Not nearly enough to validate a new case.
For someone who wants an aesthetically utilitarian case, and particularly like OP who is comfortable with it looking a bit dated, I would consider trying to find a used Fractal case locally. I get not wanting to spend that much on a case.
Sunrise here, tomorrow, is around 7:30. When I take my morning walk, presumably just after I wake up at 5:30 because the walk is supposed to “get my brain ready to work” and I’m supposed to put several hours of work in during the morning, how do I “get sunlight in my eyes”?