The only concern there would be anyone knowledgeable enough to complain about why PS5 DE is $349 while PS5 is $499, even though the only difference is a $30-$50 4k BD drive. XB can get away with it because of the overall lesser hardware specs. SNY may not be able to create the same type of price gap without receiving backlash.
Easy fix really. The PS5D can be marketed as a "subsidized" console. Kinda like how you have amazon fire devices. The machine can even be "ad-supported" if sony decided to take it there. Where when you log on you have a slightly more "ad active" home page than what you would otherwise have on the standard SKU. But that's even going too far. All they have to do is market it as a subsidized console being that the only way to buy content for it would be through the PlayStation store.
Everyone would get that.
True, and the BD drive difference should get cheaper in terms of industry cost quite quickly. Indeed, even a $100 difference just because a disc drive can be called nonsense for the picky ones.
Like I said above, the marketing, if there's such a large discrepancy (anything above $50), would be to make it sound like the reason one is cheaper isn't because of a lack of a Blu-ray drive. The smart thing to do would be to instead make it clear that that version of the console is more subsidized because the PS store is the only way to get content on it. No used games...etc.