My snarky frontend response is "devs will do anything to avoid fixing their CSS," but truly the task is too herculean to bother with on any most timescales. (You think "Untangle and reduce CSS bundle by X% with 0% improvement to any real KPI" is a ticket that's ever going to get prioritized?)

As others have said, this might be an interesting way to start zapping bloated CSS assets on aging codebases.