It is totally possible that on the second day of launch someone realized the problem, truly thought this being wrong, and deeply cared about all the impact on consumer and seller. Yet, it took them 10+ years for the circumstances to be right to get this fixed.

Commingling must have been someone's big, successful project, with all the benefits, probably faster shipping, lower cost, etc.

Once a big project got launched with all these benefits materialized, it is really hard to undo it. When a problem is identified, higher-ups usually ask to address it, rather than undoing the whole project. Anyone pushing to undo a project would be claiming the entire team up to whatever level making that original decision made a huge mistake. In other words, committing a political suicide.

It may take some mix of the following to trigger such drastic changes:

- Some fundamental assumptions changed (for example, one may claim that the logistics got so much better that the original benefits on the delivery speed can be achieved now without commingling).

- Multiple attempts at addressing the problems without killing the project proved unsuccessful.

- The ppl who original launched the project moved, to other domains or other companies.

- Some external triggers (new regulation, a large chunk of partners / stakeholders complaining, the company literally dying, etc.)

In all, there has to be someone for whom the incentive to undo it overcomes the hurdle, political or otherwise to reverse course on a huge project. After that, there need to be the usual logistics, including convincing, budgeting, prioritization, and a million other things you do at a big company to get a thing done. Now, 10 years have passed and it is finally making news.

Or, I can be totally wrong and it's just a bunch of privileged dumbasses who don't give a fork and randomly making one project after another, while pointing at some graphs and numbers claiming successes regardless of what really happens. ;)