Why do people assume light is massless?

It's affected by gravity. AKA why black holes even exist. Even if you say that gravity is the bending of spacetime or whatever, that really doesn't change the fact that pretty much by definition it only effects things with mass. And that if M2, or the mass of the thing being effected by said gravity, is zero, then the net gravitational force is zero.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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