To your point about Bootstrap being easy to migrate away from -- it certainly is. My team encourages people who feel so motivated to write Bootstrap out if they can provide a better way, with a reference implementation in the code and solid docs in a styles.md file that travels with the repo. At this point, the biggest thing we have replaced is the layout system. We use a purpose-built modification of flexbox for page layout.
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To your point about Bootstrap being easy to migrate away from -- it certainly is. My team encourages people who feel so motivated to write Bootstrap out if they can provide a better way, with a reference implementation in the code and solid docs in a
styles.mdfile that travels with the repo. At this point, the biggest thing we have replaced is the layout system. We use a purpose-built modification offlexboxfor page layout.