HD console games never had this problem since the display relationship between the specified resolution and the viewable resolution was carried over directly from the Personal Computing business: show all the pixels that the monitors claim to handle.
SDTV is an AFTERTHOUGHT in the design of HDTVs (hence why so many early models had poor upscaling, screen lag, etc.), where HDTVs don't attempt to display older-spec content the same way older TV sets do. Older TVs physically cover up the outermost margins of the screen, so there could be unseen picture, or VHS overscan noise, or unused blank/black space, whatever; most people never ever saw the contents of these margins until they upgraded their TVs (or viewed the content on a PC capture card). HDTVs tend to indiscriminately show the whole frame/picture, making no attempt to zoom & crop the screen to emulate the "viewable" picture contraints of older sets.
Few other developers overcompensate the screen size, and most don't, and that's what makes them "other developers" unlike Nintendo. Face it, the development environment does not dictate that they need to address little black bars (or progressive scan, or widescreen mode, either). The bare minimum is NTSC 480i fullscreen, and Nintendo doesn't require anymore than that. I'm sure the 3rd Party games display perfectly on widescreen PC monitors while running off the PC development environments (before conversion to TV signals); and I'm sure the games display fine on their SDTVs, so they're satisfied. Just like Ubisoft's King Kong for Xbox 360 was required to display in 720p while they messed up in SD mode; they met their minimum requirement, and they forgot to quality-check their SD mode, but it was good enough to go gold, so yay?
Nintendo has no such "refined" requirements/standards in place. All they ask is for is all games to show up on TVs via the little yellow cable they include in every box. Maybe giving developers room to be lazy, giving them no encouragement, has always been Nintendo's way of having an edge over them on their own platform.