Considering how butt ugly most cases look with optical bays, I'm glad they are being phased out. It's not worth spoiling the aesthetics and internal compatibility for a dying format.
The annoyance is that the reason most of the ugly cases are ugly is because they are either older, cheap (or just plain ugly), rather than because they have a 5.25 bay.
I'm positive it would be possible to design an aesthetically pleasing case with provision for an optional optical drive without compromising form or function.
Christ, if they can squeeze them into a laptop and mITX chassis they can fit them in a mid tower!
Most modern cases have some form of sleek slab faced front, which I would think would be super easy to conceal a drive bay behind.
E.g. look at the the fortress FT05 - you can't even see the slot loader. Or the heavily styled InWin 904. - I still wouldn't choose those cases for other reasons, but it shows what could be done to "stealth" an ODD asnd still make a statement, if there was the will to do so.
It strikes me it is like the removal of the 3.5 jack from 'phones. Something that benefits the manufacturer more than the consumer, but marketed in such a way to make you feel you are a luddite for not getting with the times.
I know I can (and probably should) just buy an external USB, but it is still ****** infuriating to not have the option nonetheless.
The fact that Phanteks released the Pro M SE must surely prove there is sufficient numbers of cantankerous old farts buying them (presumably only because of the 5.25 bay, because why else?) that there is still a market there.