I built a company in this space, so take my feedback with grain of salt.
Your comment is not correct though.
1) licensing doesn't require them to have the system in place. In fact, YouTube created the system to avoid lawsuits and is imposing it on rightsholders.
2) EUCD is not yet active. It will start 6/7/2021. CID works this way for last 12 years.
Also what you call "best practices" is called "best effort" and is related to licensing not technology. In fact the law explicitly states that filtering technology is not required.
99% of problems on YouTube are caused by the way their system is setup not by the technology itself. For instance, if single rightsholder claims 10s of content in 19 hour video, they get 100% of all money generated by the content. That has nothing to do with any deal nor the technology.
YouTube doesn't want to be in middle of the disputes, so gives the responsibility in hands of rightsholders. That's changing with the EUCD which explicitly requires the platforms to be the arbiter.
YouTube also allows only 9,000 companies and individuals to have access to what they call manual claiming, which allows them manually "overwrite" the system and produces situations like these.
There is so much more. But the problem is truly with YouTube's setup, not the technology they developed, which is quite ok.