The part before your quote, that you cut off is important.

> even on iOS you can't manually trigger a firmware update as

Having the option to manually trigger an update, and seeing the progress would not affect the average user at all.

Less features, less complexity.

Less features also results into worse UX sometimes. There's a point of diminishing returns, and Apple of recent loves to keep crossing over it, by removing useful features such as being able to trigger a FW updates when the user wants to instead of waiting around for it to maybe happen.

In the UI, yes. But the functionality is already preset. It just needs a button and a progress bar.