They'll all turn in to "the managerial class". That's the higher order function that requires high judgement, low frequency work (unlike developers, data entry, designers, BDRs, compliance, etc.)
Building is so much fun, probably my #1 favorite thing to do, but a bad company culture can ruin it. I love being a CTO so I can build and set the culture that keeps it fun.
In software engineering, "senior" or not usually means you can be trusted to take on certain problems vs. others.
In US primary school (an industry I've never worked in), this might be close to something like teacher, curriculum planner, assistant principal, principal, district supervisor, etc.
As you progress further in your field and hone your skills and knowledge, the scope and impact of your responsibilities should grow.
This has been an interesting realization for me, seeing the LLM well poisoned by its poor understanding of hooks and effects has opened my eyes up to how much the average developer also doesn't understand these things.