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My entire equipment collection is DIY except the headphones. At one point the odac and o2 was diy only.
The problem is many builds are designed around unobtainium. Out of production or custom transistors, jfet, bjts, tubes, output transformers etc. There's no substitute for these items without performance sacrifice. Md might not be able to get sufficient quantity to make volume kits.
Example, many builds are based on matched pair Toshiba 2SK170BL 2SJ174BL jfet input stage. You can't get those in mass quantity unless you hoarded them. Thats not to imply that there aren't nice builds that don't have these parts. Selection is much more limited with parts availability factored in