Hi Erata! Yeah I've put as much as possible on the map without it being too overwhelming, but there will always be the occasional need to look at the log for details.
For part destruction we have both the audio cue and animation of the parts list, though maybe something else could be done... We do already have on-map part destruction indicators for other bots--the name of the item itself, though this would likely be too intrusive to apply to Cogmind. Maybe rather than a red 'X' though, maybe just turning Cogmind red? I guess that wouldn't be quite as effective as a symbol in all cases though. These could all be optional features, in any case.
As for bot destruction, other than the log message (and seeing parts dropping and debris flying, if there's room), the audio is the primary cue, since that is both unique and long. I don't think putting an 'X' on their death location would be great in the situation you mention since then it covers up the current action. Can't think of anything else I'd want to do there...