I have a feeling USB drives will be readable for a long time to come
The drives may still be useful, but the data will long be gone. I have a flash drive from 06 that was last used in like 08 09 and most of it’s data was gone by 2019. The drive itself is fine. But what was on it has slowly faded away.
If it has digital temperature control then it has something resembling a CPU and memory. If it’s analog then it’s probably just not that accurate and will drift over time without manual calibration.
I have a pinecil and direct heat soldering irons blow away non direct heat irons like your weller (and I think this ifixit one). Once you switch you never want to go back. Which is really disappointing because I don’t think this new ifix it one is.