While this is true and I agree, that choosing a framework should not be the first thing to do when starting a project, we have frameworks for a reason. You can't develop everything from scratch and it's not so easy to do some changes even if we are speaking about purely cosmetic changes like switching from bootstrap to material design. It's just like when building machines - their parts are carefully designed to be transportable... which in turn seems to depend how wide a horse's rear end is...
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