With only two films, Avengers Infinity War and its follow-up sequel Avengers Endgame, Josh Brolin (Deadpool 2, Dune)'s Thanos "The Mad Titan" has become one of if not the most iconic cinematic villain of the current generation of film. Though Thanos' general motivations have been somewhat altered from the original source material to help accommodate the established Marvel Cinematic Universe (MCU), there is an undervalued minor alteration which goes to the height of "The Mad Titan".
As to be expected from a villain of his size and magnitude, MCU Thanos ultimately arrives at a monstrous height of 8'3. In comparison to Thanos, the revered Marvel film trinity of Iron Man and Captain America at 6'1 followed by Thor at 6'3 are greatly inferior to their purple-skinned nemesis, with Thor being the closest in height to Thanos on film. There have not been many MCU villains that are shorter than their protagonists, they have mostly been on equal footing literally as well as internally.
1984's The Official Handbook of the Marvel Universe's Book of the Dead And Inactive II list's comic book Thanos as being 6'7, a few inches taller than the 6'2 dictator Doctor Doom but smaller in comparison to the 7' powerhouse The Incredible Hulk. But, Thanos still holds the high point victory over several of his closest enemies who have challenged his great power throughout the years. The pinnacle of Thanos' comic career, 1991's legendary cosmic affair The Infinity Gauntlet clearly showcases that Thanos also towers over the cosmic heavy-hitters Adam Warlock (6'2), Silver Surfer (6'4), and even Thanos' brother Eros a.k.a. Starfox (6'1).
If the MCU depiction of Thanos followed in the vein of the comics and made the character's height 6'7, it would be harder for the audience to take Marvel's ultimate big bad as seriously. A villain who is slightly below the same height as The Incredible Hulk at 8'2 but towers over mainstay heroes Captain America and Thor is a relatively certain method to intimidate not only the heroes but the film audience. His height also makes him seem more alien, as opposed to being the size of a normal human. Thanos' height is not the end all be all of "The Mad Titan" as it may be to other characters such as the X-Men's Wolverine - but making him more physically opposing went a long way in making him seeing more threatening.
The original interpretation of Thanos may pale in comparison when it comes to the stature of his film counterpart, but some aspects of the comics are better left in the printed page. Thanos' unscrupulous lust for power needs to envisioned not only through his character mentally but psychically as well. The actions which Thanos commits should be just as grand as his personality and figure.