...The rationale basically being, at this point, they get tagged on them (by me) anyway :p (e.g. T416970#11600701, T416440#11582344, T412325#11450239, and the same for some of the other tasks returned by this search query).
But more seriously -- because these components don't have any code stewards, they - IIUC - don't have anyone whose job it is to triage the automated cron-job-failure tasks that get filed about them (xref T341555#10760093). As a volunteer without Logstash access, I currently find myself tagging ServiceOps on these tasks almost without exception, in order to - at least - retrieve the error's stack trace & time. If this information wasn't retrieved by serviceops for these tasks that get filed, I worry that they might just end up sitting around Phabricator 'gathering dust' (so-to-speak), which doesn't seem like it'd be beneficial to anyone (and - at which point - it feels like cron-job-failure tasks for unstewarded components might as well just not be automatically filed at all).