I'm using LLMs to assist my development and I'm measurably (in all the ways we
    engineers could possibly care about) doing better work faster.
Studies suggest you aren't any faster and may in fact be slower. It's difficult to study such a new tech, but even optimistically, empirical evidence is only showing a ~3% gain in some domains.

Writing code is rarely the limiting factor in our work.

There's no uncertainty here. Every day I ask myself how long something I did would have taken without it. The answer is always crystal clear. It's not hard or difficult at all.

Those studies have well known flaws. I'm measuring my output so I happen to know I'm not only going faster, but the quality is better.

I'm not vibe-measuring my output ;)

studies suggest nothing. i've released a massive number of features in the last year for several projects that i estimate would have taken me multiple years to put together in a much more mentally exhausting way.

Your drive-by comments are unwelcome. You can estimate all you want, but the data is collating, and it isn't within your worldview.