Agents are new, but dumb coding practices are not. Despite what it may seem, the knowledge of how to manage development has increased. One practice I haven't seen for a while is managing by limiting the number of lines changed. (This was a dumb idea because rewriting a function or module is sometimes the only way to keep it comprehensible - I'm not talking about wholesale rewriting, I'm talking about code becoming encrusted with conditions because the devs are worried that changing the structure would change too many lines)

Managers jobs are more at risk than senior engineers.

My company, and few others I know reduced the number of managers by 90% or more.

Tell me you're not a SWE without telling me. Engineers hire engineers at tech companies. Managers do the hiring paperwork.