You said that widescreen is the original aspect ratio as intended, and anything else is altered.
But not a lot of movies (if any) have an original aspect ratio of native 16:9. Even on a widescreen TV, you're getting the sides cropped off, or you're seeing it slightly letterboxed. I don't know what they do over there, but over here we generally get the sides lopped off to fit 16:9, so you're still losing picture. You're losing less image than at 4:3 cropped, but you're still seeing it altered and not original. The point is that 16:9 television widescreen =/= cinema widescreen, so it is not the original aspect ratio. You look at "widescreen" as being one thing, but it's a general term for "anything wider than 4:3", just as high definition is just a loose term for "anything higher than standard definition".
Same goes for television. The original aspect ratio of television is 4:3. 16:9 is a recent standard. Some notable shows were shooting widescreen in the mid 1990s, but for the most part it's been phased in over the past decade, with some shows only finally switching over in the past couple of years.
So your statement is only true for about a decade of television, which has mostly been a response to the push towards 16:9 widescreen televisions.
I'm not saying this as a point against widescreen television. If all new shows are 16:9, you should get a TV to see new content as intended, and it's a decent compromise between the television standard up until now, and the cinema standard of the past 50 years. But for the majority of existing content, it is not the original aspect ratio, including cinema. It's just closer than it was.