some poeple don't post their finds online for a lot of different reasons. That is one thing I would not let get to you since there is absolutely nothing you can do about it.
As a participant of a challenge cache requiring finds of caches not found for 6+ months I was rather peeved after spending an hour driving to a cache only to discover it had been found 2-3 weeks earlier but not logged online (and still hasn't)... A quick look at the finder's profiles and discovered no finds logged for over a find. Now, I do understand it's not always possible to log immediately, and a find recorded in the logbook is a find (and better than those who don't write) but I feel there should be some limit to the post-find-online-log time delay allowed by the system - say a month? - when it will not except the actual log-date if only for the purposes of these sorts of challenge caches. They still have and will claim their find, and could log it with a post-find date if/when the get around to it, but it won't mess things up for others doing challenges and the like. I think a month is a reasonable if not overly-generous length of time to allow?
Another pet peeve as cache owner (and finder) is those who rubber stamp the logbook but don't record a date. It's not so bad when they stamp in place/order so that the chronology can be roughly determined but stamping right in the back of the logbook with no date?... (I have stamps of my own on order, but intend on dating them and only using them of those large, generously spacious ones - not micros/nanos!...)
As for short logbook records, I don't have a problem with them. As a mostly urban-cacher micros are usually the order of the day so date and name is sufficient, perhaps a quick note or yes, even TFTC, to save paper/space and delay logbook maintenance but a decent online log story is appreciated. I actual prefer that to long cache log, short online log as I see the online logs and only periodically do a quick check up on the cache if there's been no reported issues. Or logbook entries that use up a whole page for date+name... Compact, concise, clear please!
Those who write their whole name large and in full over several cells on nano-log-strips even when they are pre-printed "initials only"...
Those who FTF my puzzle caches I spent days working on without leaving a respectful hour of time to pass!