Very important point on good tech managers.

Strong engineering orgs hire managers who could do and have done most of what their team does. Most TPMs at G, for example, have CS degrees.

Non-technical managers have the organizational leverage to undo any amount of design & planning that skilled people underneath them set up. It's the brain equivalent of having ADHD -- your executive control shuts down and that sabotages long-term goals.

If you've never lived through this, watch the beginning season 3 of silicon valley where their new CEO wants them to 'just build a box' and gets angry when the conversation gets any more specific than that. (If you have lived through this, don't watch it -- it's too real).