Marxon
Yes, you described the Latch Time scenario well.
If you only have a small number of LEDs the processing time is anyway greater than the time the strip required doing the updates.
But if you have many LEDs, latch time might get relevant.
There are strips that work via a different protocol (e.g. AP102) which do not need any latch time at all.
Refresh/Rewrite time.
There are LED strips (maybe in the past...) which do not maintain one update over a longer period of time.
In that case you need to refresh the strip or in other words rewrite the latest update.
Refresh time does not kick-in, if you have a continuous stream of updates.
But in case you send only a single color effect or disable the device (which is sending one! update of black saving resources),
some strips do not maintain the color after a while.
Therefore, the hyperion device rewrite the latest update to help the strip maintaining a stable color.
If Refresh time is misleading and Rewrite Time is more intuitive, I am happy updating the naming in the UI....