Professionally speaking, because I can build fast forms with it. But personally I prefer using CSS Grid and Vanilla CSS (or Sass) instead of Bootstrap.
I started my web dev career using Bootstrap and in the last year when I learned a lot of CSS that make me analyse when I have to user Bootstrap and when not.
Same here. I feel like the Bootstrap Grid can especially help out when a developer lacks a deep CSS knowledge. But once you know flexbox or CSS grid, the need for the Bootstrap Grid is diminished.
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