WHY learn chess using bullet?

People will tell you that your chess rating could increase much faster if you learned chess through books or studies.

However, let's quote Thanos from the Marvel Cinematic Universe: But at what cost?

Analysis and study take time, effort, and energy, and may not be enjoyable for you. Given the barriers and mental energy required to take chess seriously, you might not play at all if you had to "study"!

In that case, the reason to learn through Bullet instead of traditional learning methods is: because it's fun.