why not?

Don't be obtuse. the reasons why not were spelled out in the GP.

[flagged]

Inertia. Twitter has basically no value, it's just a bad app and bad website. It was never actually "good" for information communication, but it was tolerable.

When it comes down to 99% of these "why are people using sucky thing?" questions, the answer is inertia. Never confuse popularity for quality, they're completely orthogonal.