The appletv isn’t big. Literally the size of your palm. Why can’t you travel with one? You really want something that’s you can pick up with two fingers instead of your hand? Doesn’t seem like much of a difference to me overall. The size of the appletv is very small.
I HAVE traveled with an Apple TV. (It's not as romantic, or effective, as one might think, 'Throttled internet' anyone?)
Until Apple comes up with a dongle cable set that replaces ALL of the cables that would have to plug into yet another propriety connector on the market, the cable rats nest will continue.