Self update from that other thread at ZHA - Philips Hue Dimmer Switch (individual buttons with long presses) – I just realized my weeks-old dimmer purchase has the more detailed zha_event like @term had prior. My other three remotes that are likely 3 years out-of-date on firmware updates have this Blueprint’s simpler zha_event structure.
Based on @term’s statement they upgraded firmware, I suspect my “new” remote has a very old firmware. The “firmware” value in Home Assistant’s Zigbee details show the same on both remotes, however, so I am unclear what value to trust to sort this out. I do not have a Hue hub to check further firmware information, unfortunately. Anyone have ideas/similar experiences?