I mostly agree with your experience, but;
Every day I deal with bad judgement calls from humans (sometimes my own!), but I don't screenshot them because it's not polite.
I don't think we're at the top of the curve yet? Current AIs have only been able to write code _at all_ for less than 5 years.
Code in particular is a domain that should be reasonably amenable to RL, so I don't think there are any particular reasons why performance should top out at human levels or be limited by training data.
I see people on here all the time saying this tool or that model regressed. It used to be better.
There are clearly some pressures to make it worse. Like it's expensive to run. And unbelievably that it's under provisioned somehow.
Could you have looked at early Myspace and declared social media would only get better? By some measures it was already at its peak.
Personally I don't think coding agents will regress significantly as long as there is competitive pressure and independent benchmarks. Regulation is a risk because coding may be equivalent to general reasoning, and that might be limited for political / "safety" reasons.
Social media "regressed" from the point of view of users because the success metric from the network's point of view was value extraction per eyeball-minute. As long as there continue to be strong financial incentives to have the strongest coding model I think we'll see progress.