The purpose of styled components (or CSS modules or what have you) isn't to deal with specificity. It's to deal with collisions between what are essentially global variables.
I don't think you and I disagree. Use the tool appropriate for the job. If the team doesn't have the discipline or will to use the cascade as intended, definitely, better to have a bloated CSS-in-JS that at least is usable, rather than a bloated cascade that people are afraid to use.
