> when managers code daily
No offense but this doesn't sound like a well thought out idea. Have you worked at a tech company as either a coder or a manager?
Why should managers code daily? What would they be coding up anyway? If you're saying they should be coding features in the product, then I think you're just saying there should be no middle managers. That's been tried a lot in many different forms over the years, and there's a reason the majority of successful tech companies still have managers.
If you're saying that managers should be coding the tools that they use themselves for managing their employees - why? Their job is talking to the people they manage, listening to them, helping to solve problems, helping to make trade-offs to deliver the product on time, coordinating with other people in the company to keep things running smoothly on their team, etc. If you have a problem that does require a technology solution, like keeping track of tasks or automating some part of the team's work, then it will be orders of magnitude more effective to buy a solution that already exists or hire a team of coders to build it rather than have each individual manager trying to code up solutions themselves. That would be a big distraction from their main job of actually managing their team. Until you can automate the whole job of a manager with an AI, the important parts of the job are just not things that you can easily code up a solution to.