If I pitch this to my CTO, he will agree that using my knowledge to build things better and faster aligns with business goals.
Only middle management rationalizes theories such as you proposed. Middle management sometimes just forgets what is the goal of their job and instead focuses only on their actions (self obsession), ego and the presentation of success. An example of middle management self-obsession is your use and throw mentality. Middle management does this because they don't actually listen to their reports. Managers think they are on another dimension and don't need to hear anything from anyone.
A really competent middle manager would know that senior engineers, especially ones with tribal knowledge are the real 10x engineers in practice. Not because they type fast, not because they are hungry and energetic but because they can process situations and circumstances faster in their head to yield results.
If I were a middle manager, I would do my utmost to retain trustworthy people around me. It's almost a no brainer productivity boost.