i recently sat down over a weekend and did the same after realizing that i should hammer out something i can use for myself - it dawned on me the work i thought i might be saving with frameworks was offset by the work i'd wind up doing to them - having to go through and cut out all the stuff i wound up not using, changing defaults to things i like etc.

i think a part of that was also realizing what drew me to frameworks initially was less about styling and more about the grid or flexbox etc scaffold - the most daunting part for me to this day. creating my own set of base templates helped me learn quite a bit about grids though, and now when stuff breaks i can tackle it with more confidence in where to look for the issue and how to go about fixing it.

that being said, i'm not anti-framework or anything - i relied on them alot as i learned CSS, and even now i still treat them like something akin to styleguides or catalogs of what's new/trending in webdesign