It’s part of an effort to have dedicated managers and dedicated engineers instead of hybrid roles.
This is being sold as an efficiency win for the sake of the stock price but it’s really just moved a few people around with the TLMs now 100% focused on programming.
The hybrid role idea has always been ridiculous. It's two different jobs, like being a mechanic and an accountant. Do you need a mechanic? Cool, hire a mechanic. Do you only need a mechanic part-time? Cool, hire a part-time mechanic. But I don't want my mechanic stopping and starting the work on my engine 3 times a day because somebody has tax questions.
The whole point behind the division of labor is to specialize, and get really good at your specialization. Picking up multiple very different jobs and trying to do both is the opposite of efficiency. People knew this 250 years ago.