Then maybe HD isn't all it's cracked up to be. If it can't even handle/adapt to showing older shows the way they were originally made I call that a flawed technology that shouldn't have been released until it could cope with it. The problem isn't with the original shows, it is with the new tech.
There's a flaw in your logic. The way older shows looked on your TV back in the day isn't
what the filmed footage actually looks like. Pick up a blu-ray copy of TOS remastered; that's
close to what the film actually looked like. The problem was the flawed technology back in the day didn't allow you to see that.
That's like you watching a color movie on a black and white television and thinking that's what it's supposed to look like. It's isn't.
The original TNG, DS9, and VOY film has always been as detailed and crystal clear as TOS remastered. You just were never allowed to see most of the detail that's already there.
Those of us who wanted TOS remastered, and those of us who'd like to see other shows remastered are talking about preserving that film.