Part of the problem is that the law didn't seek to distinguish between tame first-party cookies and the really naughty third-party cookies so the burden is equal regardless of how malicious the service is.
> For the company, it's a one time JIRA ticket for a junior software engineer to code up a banner.
This is actually not true. There's a lot more that goes into a cookie banner than you might realize, and there's now an industry dominated by a small handful of players (Osano vs OneTrust)