I bought a DX7 last year and I love it. Very heavy, which seems to be mostly from the metal case more than anything. I don’t know about 12-bit DACs or aliasing being heavy considerations, to be quite honest, it just makes really lovely sounds and I wanted a hardware polysynth.
I also have Dexed, and honestly I almost prefer not seeing all that information at once—I haven’t had the patience to get to know it as well. I would echo the complaint about editing the envelope generator values by hand on the DX7 though, it’s a lot of paging. Sometimes I’ll start patches in software, just since I come up with different ideas that way, and then move to the synth when it’s time to fine-tune.
For fun I started putting together my own “8-bit” polysynth in Max, since I’ve been finding I really love that lo-fi, Commodore64-type sound. (“8-bit” in quotes because even though I calculated the wavetables using 8-bit integer math, the rest of Max is in floating point.) That’s been a really fun exercise—how many controls do I give myself? what do I leave out?