Linux looks like shit with any tab width besides 8. Simple example: https://github.com/torvalds/linux/blob/master/kernel/livepat...

Notice there are a couple examples in that code where multiline method calls are meant to line up, and if tabs are not set to 8 they don't line up.

This feels like a partial proxy question for Unix versus non-Unix development. Unix developers are, in my experience, consistently more interested in configuring their IDEs, which underlies many of the arguments for tabs over spaces.