2. tends to happen less with more experienced engineers

I think the mistake is assuming you get high quality work with an agent regardless of the driver’s skill level. That doesn’t appear to be the case, but it’s the value prop that is being sold.

2 is true even for highly experienced engineers over the long horizon, you keep building and then you realize that there's a better pattern that you should refactor a bunch of stuff for, but it gets tabled because feature XYZ is more important, and then feature YZW, etc. and then one day you're faced with looking down the abyss of committing to a refactor while some JE wants to rewrite everything in rust.