system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA] If a fire bender were blind, could they see by sensing heat? Could Firebenders develop the ability to detect heat or fire the way Toph can feel the earth?
gpt
I think it may theoretically be possible in a *very* spiritually powerful firebender. It's been shown that firebenders have a similar ability to water healing, but instead they heal chi or something. The reason it would be harder than it would for an earthbender, though is because seismic sense is actually a natural part of earthbending that was merely forgotten (because simply seeing is easier) or not learned from badger moles (again because it's simpler to use your eyes). 

Another challenge would be that, with earthbending you have a direct "line of sight", so to speak, because the earth between yourself and your surroundings are very straightforwardly connected. By simply turning dirt into sand, an accomplished and experienced seismic sense user like Toph had her "sight" greatly diminished. She was eventually able to master sand as well with practice, but it still took a while.

I think an airbender would have a slightly easier time as air is similarly always connected and even still air shifting from someone's movements could likely reach them. But air isn't as efficient at transferring movement as earth is. There's a reason why bunker busters are so effective.