I think PC is intended to cover anything that can use steam. I had still an old classic build kicking around on my HD, but DQDX required hooking it up^ to steam, suggesting this is the way forward for “PC”. I know now I get patches on my mac at the same time as windows boxes do - although I think that is primarily Lar’s decision and the patches could be de-synced if needed.
^ Turns out, I had the weird case where afaik I bought the preorder direct. After an extended time not getting any updates, I’d asked Lars about it, and he directed me on to steam. I think as far as he knew, my old setup shouldn’t even have existed, since I hadn’t gotten it though any of the expected channels. He ended up sending over a fully new key to get it set up on steam, since we couldn’t track down how I’d gotten the old version.
I do intend, one of these days, to try and re-check the 201 star hero mode difficulty between DQDX and classic, since I’ve got both. I think item bugs were the only difference we knew of - both old and new. All the new ones are fixed (as far as we know) - I don’t know if the old item bugs (that make them less effective than intended) matter for pushing the limit like that.