Now that you mention it, that's probably one of the reasons I went with a very short, one-line only feedback in the original bridge: between the eink driver bundling or throttling updates, and the boot process triggering some (or not) depending on the device and/or FW versions and/or ambient temperature, just a flash and a glimpse that something happened ended up being good enough
.
eips -h *may* also exhibit some extra-weird behavior on that front, but I may be confusing things, or remembering its behavior on very old devices.