I thought DRPGs played a lot like first person roguelikes--first person, big RNG maze? Maybe not. I can't recall the last actual DRPG I played
They do play a lot alike in that there are similarities and fans of one often enjoy the other.
Common differences (I'm sure there are exceptions) --
-traditional DRPG is first person dungeon crawling, roguelike is topdown / sometimes iso
-traditional DRPG has hand crafted maps, often with traps and puzzles, roguelike is RNG maze (often with some level of handcrafted elements, or some handcrafted puzzle/plot/store levels added to each dungeon from a large pool of variants)
-traditional DRPG is party based, traditional roguelike has a single hero (exceptions exist)
-traditional DRPG has save system, roguelike is permadeath
from someone not versed in them, i'm sure they'd seem very similar. You start underpowered, explore dungeons tile by tile, find lewt, get powerful... they both scratch a lot of the same itches. Permadeath may (as always) be the great divide that pushes some into one camp or another... I'm perfectly at home in either.
Wait, the NEW brandish? The one that's a week old? I don't get why it's possible for Vita games to be on the webstore and not the Vita store (and the PS TV store is just baffling). This should be a unified database and the stores just pull "is this game for me" from the data. From the issues they have it seems to not be.
You're absolutely correct that it should all be pulling from a single, robust db. It's hard to tell as an outsider, but I think it is... I think it's just an antiquated db originally designed for a single platform (ps3) with everything else glommed on. PSP didn't create to many issues at first, but once the vita was released it created issues because (just guessing here) the issue of 'psp games that do/don't work on vita' was badly implemented/glommed into the existing systems (db/back end, and front end for editors).
This is just guesswork, obviously, I haven't had my hands on it. The idea of redesigning it from the ground up sounds fun to me though, fwiw.