Like other positions in hockey, there is a cap to how tall a player can realistically be while still being effective. Chara pushed the limits because he was a phenomenal athlete in addition to being tall. But Chara was a defenseman where being enormous allows for physical domination; in net, there’s no particular reason to tower over the goal cage. A little extra length on the arms and legs theoretically helps cover more net, but that’s not really a glaring problem that needs to be solved for a typical NHL-sized goalie, and the extra length comes at a price.
As we see routinely in the NBA, once you get to a certain height the players usually sacrifice the quality of their footwork due to having longer limbs and a higher center of gravity (unless they are a Wilt level athletic freak). In goalie terms, the higher center of gravity impacts their ability to move around the net and make snap reactions. Kind of like how playing with a very long hockey stick allows you to cover more space, but at the cost of making quick efficient movements and maintaining fine tuned control.
I actually do think there might have been a time about 15-20 years ago when it could have worked out well for him, because he could have gotten away with being more of a net-blocker with cartoonishly huge equipment. But rule changes have forced a degree of athleticism back into goaltending, and that puts super-tall players at a disadvantage.